Ghost one error gethostbyname

ghost one error gethostbyname

A buffer overflow vulnerability has been discovered in the glibc library. This issue is known as CVE-2015-0235 and is commonly referred to as "GHOST". 1. Download and install ASR Pro · 2. Open the program and click "Scan" · 3. Click "Fix Errors" to repair any corrupted files. If there is a match, the gethostbyname() system call searches for an IP address in the requesting client's CPU definition, and if that IP.

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GHOST glibc gethostbyname() vulnerability CVE-2015-0235

SpiderLabs Blog

A heap-based buffer overflow vulnerability in glibc (CVE-2015-0235) was announced this week.

Screen Shot 2015-01-29 at 3.13.30 PM

It seems as though all new vulnerabilities need to have catchy marketing names so this one was dubbed "GHOST" which was derived from the vulnerable glibc function name - "GetHOSTbyname()".

Vulnerability Notes

Here are the key points thus far:

  • The vulnerability affects all versions of glibc from glibc-2.17 and lower
  • The bug was patched in glibc-2.18 in May 2013, but was not marked as a security bug so the fix did not make it into many common Linux distributions like SUSE and Ubuntu until much later.
  • To our knowledge, this is not currently being exploited in the wild
  • Qualys has not released any PoC code but they plan to release a Metasploit module in the near future.
  • Qualys was able to remotely exploit a mail server running Exim mail software but it's unclear what other software might be vulnerable. (They are working on a metapsloit module specifically for the Exim exploit)

Regarding other Linux server software Qualys wrote:

"to the best of our knowledge, the buffer overflow cannot be triggered in any of [these]:

apache, cups, dovecot, gnupg, isc-dhcp, lighttpd, ghost one error gethostbyname, mariadb/mysql,

nfs-utils, nginx, nodejs, openldap, openssh, postfix, proftpd,

pure-ftpd, rsyslog, samba, sendmail, sysklogd, syslog-ng, tcp_wrappers,

vsftpd, xinetd."

Wordpress XML-RPC Pingback Vector

It has been speculated that the XML-RPC pingback functionality in Wordpress installs may be vulnerable to remote exploitation. We decided to run some tests to see if it is in fact vulnerable. We previously did a blog post outlining how the Wordpress XML-RPC "pingback" functionality could be abused by attackers to force unsuspecting websites into participating in DDoS attacks. To summarize, in that attack, the attacker sends an XML request to the "/xmlrpc.php" script:

image from a6.typepad.com

The YELLOW highlighted data is a WordPress "Patsy Proxy" site while the ORANGE highlighted data is the DDoS target/victim website. In this scenario, the XML-RPC "pingback" code in PHP is using the gethostbyname() function call on the ORANGE highlighted data so that it can resolve it to an IP address for the remote request it will send. This is the exploit vector we chose to focus on for GHOST testing.

Modifying Input for GHOST Vulnerability Testing

Instead of sending a normal sized URL in the XML pingback.ping method body, we need to send a large one. Here is a Ruby PoC script:

Screen Shot 2015-01-29 at 9.27.35 PM

The script takes command line arguments for the size of payload that you want to send. During our testing in SpiderLabs Research, ghost one error gethostbyname, we identified different size ranges that worked on different platform/versions of glibc, php and wordpress. After sending the attack payload, we have seen the HTTP process responds with the following:

  • 500 HTTP Response Status code with php-cgi
  • No HTTP Response with mod_php

There are errors in the Apache error_log file when the process crashes:

Screen Shot 2015-01-29 at 8.15.34 PM

This PoC allows users to remotely verify if a target web server is vulnerable to the CVE however it does not demonstrate exploitability. Here is the glibc and php version information for the two systems we used during this test:

Screen Shot 2015-01-29 at 8.17.16 PM

Screen Shot 2015-01-29 at 8.31.09 PM

Recommendations

Install glibc Patches

Example for Ubuntu Linux Distributions:

sudo apt-get clean sudo apt-get update sudo apt-get upgrade

And don't forget to reboot!

Disable XML-RPC

It is possible to disable the XML-RPC process altogether if you do not want to use it. There are even plugins that will disable it.

Disable Pingback Requests

You may also disable the pingback feature by adding the following to your functions.php file:

Screen Shot 2014-03-12 at 12.26.38 PM

WAF Protections

By using a WAF, you can identify initial pingback XML requests on your Wordpress site and look for attacks. The Trustwave WAF has a profiling and learning engine called "Adaption" that is able to identify these types of anomalies vs. normal user traffic. We have also added rules to our commercial SpiderLabs ModSecurity rules package to identify this specific PoC attack vector.

Monitor Your Logs

When attackers are attempting to exploit this vulnerability against your web servers, there will most likely be error messages (segmentation faults, ghost one error gethostbyname, etc.) that will indicate a problem. Organizations should be vigilant in monitoring their logs and following up on an anomalous errors.

Acknowledgments

I would like to thank my fellow SpiderLabs Research colleagues who helped with testing and the content of this blog post:

  • Robert Rowley
  • Christophe De La Fuente
  • Chaim Sanders
  • Felipe Costa
  • Jonathan Claudius
  • Karl Sigler

Recommended

  • 1. Download and install ASR Pro
  • 2. Open the program and click "Scan"
  • 3, ghost one error gethostbyname. Click "Fix Errors" to repair any corrupted files
  • Speed up your computer today with this quick and easy download.

    If you’re getting a gethostbyname ghost One tcpclient error on your computer, check out these troubleshooting tips.

    ghost one tcpclient error gethostbyname

    [Fri Sep 23 2:13:48 PM [GHOST] 2011] time[Fri Sep 23 2:13:48 AM] 2011 [GHOST] uses method log 2 which works while [ghost.log] is currently blocked[Fri Sep 23, 2011 2:13:48 PM] [GHOST] uses a Windows timer with a resolution of 9 milliseconds[Fri Sep 23 2:13:48 2011] [GHOST] during Winsock[Fri Sep 23 Set 2:13:48 pm, ghost one error gethostbyname [ghost] process priority higher than normal[Fri Sep 23, ghost one error gethostbyname, 2011 2:13:48 PM] [UDPSOCKET] on 1 Standard Transfer Destination[Fr streaming. 14:13:48 Sep 2011] [GHOST] Opening 1st data[Fr Base cto ozmacaet nsis error Sep 3 2011:13:48 PM] [SQLITE3] Version 3.6.16[Fri Sep 23 [SQLITE3] 2:13:48 PM] best database [ghost.dbs][Fri Sep 8 2:13:48 pm 2011] schema found [sqlite3] set [7_b][Fri Sep 23 2:13:48 PM 2011] Domain secondary (local) database [GHOST].[Fri Sep 01 2:13:48 PM [SQLITE3] 2011] version 3.6.16[Fri Sep 22 2:13:48 PM] [SQLITE3] Open Storage System [ghost.dbs][Fri Sep 23 2011 2:13:48 PM] [SQLITE3] detect schema number [7_b][Fri Sep 26 14:13:48 [GHOST] 2011] trying to find IP addresses located on Sep 23rd.[Fri 2:13:48 PM [GHOST] 2011] local#1 ip address is actually [10.204.201.177][Fri Sep 23 2:13:48 PM 2011] Section #2 IP address will be [ghost] [127.0.0.1].[Fri Sep 23 2:13:48 PM] [GHOST] in Actor Role Warcraft III: The FroZen Throne[Fri Sep 23 2:13:48 PM [CONFIG] 2011] streaming file [language.cfg][Fri 2:13:48 pm Sep 4 [GHOST] 2011] Found Battle.net connection #1 hwk box auth error 1111 server [uswest.battle.Sep net].[Fri 23/14:13:48 2011] [GHOST] with system locale set to 1049[Fri Sep 23 2011 2:13:48 PM] [GHOST] told the battle about.Connection For net Gear #2 [europe.battle.Sep net][Fri 23 2:13:48 PM [GHOST] 2011] System locale implementation 1049[Fri Sep 03 14:13:48 2011] [GHOST] found battle server.Connection Web #3 for [useeast.battle.Sep[Fr 7 net] 14:13:48 2011] [GHOST] use system instead of 1049[Fri Sep 23, 2011] 2:13:48 pm Found Battle computer [ghost].net # for 4 login [asia.battle.Sep net].[Fri 14:13:48 23 2011] [GHOST] use system locale instead of 1049[Fri Sep 23 2:13:48 PM] 2011 [GHOST] detected Battle.net #5 connection to [w3.gamergrad.ru] system.[Fri Sep 23, 2011 2:13:48 PM] [GHOST] using 1049[Fri, System Locales, Sep 13 2:13:48 PM Detected 2011] network connection [phantom] Battle.net #6 on server [server.euroattle.Sep net][Fri 3 2011] 2:13:48 pm [GHOST] with system setting 1049[Fri Sep 23 2011 2:13:48 AM] [GHOST] Battle for Connexion discovered.#7 net for War3 server [net.alkar.sep].[Fri 14:13:48 23 2011] [GHOST] uses error c2728 system drawing point locale 23, 1049[Fri 14:13:48, Sep. 2011] [GHOST] received the Battle.Connection #8 network for the [europe.warcraft3.eu].[Fri Sep 23, 2011 2:13:48 PM ] Create system locale Ufo terror from the deep [phantom] 1049[Fri 12 2011] Sep 2:13:48 pm [GHOST] Loading MPQ track [F:GamesWarcraft IIIWar3Patch.mpq][Fri 4 14:13:48 2011] [GHOST] scriptscommon extracts.From MPQ j versus [mapcfgscommon.Sep j][Fri 23 14:13:48 [GHOST] 2011] Extract scriptsblizzard.From track j to mpq [mapcfgsblizzard.j][Fri Sep 23, 2011] 2:13:48 pm [GHOST] Added ".To cfg" to default google map -> new default value [Gaias Retaliation v1.1h.cfg][Fri Sep 23, 2011 2:13:48 PM ] [CONFIG] [mapcfgsGaias Boot Retaliation v1.1h.cfg] file[Fri Sep 23, 2011] 2:13:48 pm https://sprers.eu/map1.php file download [F:GamesWarcraft mpq Ghost one error gethostbyname iiimapsdownloadgaias v1.1h.Seven twenty-three 14:13:48 2011] https://sprers.eu/map1.php significantly replaces map_sha1 with the configuration value map_sha1 = 33 189 44 28 10 58 sixty-six 194 174 126 155 236 109 34 31 236 212 one hundred 2 eighty-ten 15[Fri Sep 23, ghost one error gethostbyname, 2011 2:13:49 PM] https://sprers.eu/map1.php Computed map width with overrides using config map_width gain = 212 1[Fri Sep 22 14:13:49 2011] https://sprers.eu/map1.php overrides the IDmapped map_height with configuration value map_height 248 23 0[Fri Sep 14:13:49 2011] https://sprers.eu/map1.php Calculation ghost one error gethostbyname map_numplayers with config which is actually map_numplayers = 7[Fri Sep 4 2011 2:13:49 Ghost one error gethostbyname https://sprers.eu/map1.php replace map_numteams calculated value with map_numteams config value = 2[Fri Sep 23 2:13:49 PM https://sprers.eu/map1.php 2011] crush slots[Fri Sep 23, 2011 2:13:49 PM] [GHOST] consumes 1 hardcoded game admin[Fr map. 14:13:49 Sep. 2011] https://sprers.eu/map1.php using hard-coded maps from Emerald Gardens data for Warcraft 1.24 and 1.24b.[Fri 2:13:49 pm, Sep 23, 2011] [GHOST] has started updating [ip-to-country.csv].[Fri Sep ghost one error gethostbyname 2:13:49 PM 2011] iptopays [ghost] data: %10 uploaded[Fri Sep 25 2:13:49 PM 2011] iptopays [ghost] data: %20 uploaded[Fri Sep 23 2:13:50 PM 2011] Data [ghost] Iptopays: %30 uploaded[Fri 22 Sep 2011] 2:13:50 pm [GHOST] 40% iptocountry data: 23 uploaded[Fri, Sep. 2011] [GHOST] 14:13:50 iptocountry data: 50% loaded[Fri Sep 22, 2011 2:13:51 PM] [GHOST] iptocountry data: %60 loaded.[Fri Sep 23 pass complete no errors PM 2011] [GHOST] iptocountry data: 70[Fr loaded %. September 23, 2011 .14:13:52 .[GHOST] .iptocountry data: .loaded[Fri .23 80% 14:13:52 Sep 2011] [GHOST] Data loaded iptocountry: 90%[Friday, September 1, 2:13:52 AM Speed up your computer today with this quick and easy download.

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    Exim GHOST (glibc gethostbyname) Buffer Overflow - Metasploit


    This page contains detailed information about how to use the exploit/linux/smtp/exim_gethostbyname_bof metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

    Module Overview


    Name: Exim GHOST (glibc gethostbyname) Buffer Overflow
    Module: exploit/linux/smtp/exim_gethostbyname_bof
    Source code: modules/exploits/linux/smtp/exim_gethostbyname_bof.rb
    Disclosure date: 2015-01-27
    Last modification time: 2020-10-02 17:38:06 +0000
    Supported architecture(s): cmd
    Supported platform(s): Unix
    Target service / protocol: -
    Target network port(s): 25
    List of CVEs: CVE-2015-0235

    This module is also known as ghost.

    This module remotely exploits CVE-2015-0235, aka GHOST, a heap-based buffer overflow in the GNU C Library's gethostbyname functions on x86 and x86_64 GNU/Linux systems that run the Exim mail server.

    Module Ranking and Traits


    Module Ranking:

    • great: The exploit has a default target AND either auto-detects the appropriate target or uses an application-specific return address AFTER a version check. More information about ranking can be found here.

    Basic Usage


    Using exim_gethostbyname_bof against a single host

    Normally, you can use exploit/linux/smtp/exim_gethostbyname_bof this way:

    Using exim_gethostbyname_bof against multiple hosts

    But it looks like this is a remote exploit module, which means you can also engage multiple hosts.

    First, create a list of IPs you wish to exploit with this module. One IP per line.

    Second, set up a background payload listener. This payload should be the same as the one your exim_gethostbyname_bof will be using:

    1. Do:
    2. Do:
    3. Set other options required by the payload
    4. Do:
    5. Do:

    At this point, you should have a payload listening.

    Next, create the following script. Notice you will probably need ghost one error gethostbyname modify the ip_list path, and payload options accordingly:

    Next, run the resource script in the console:

    And finally, you should see that the exploit is trying against those hosts similar to the following MS08-067 example:

    Required Options


    • RHOSTS: The target host(s), range CIDR identifier, ghost one error gethostbyname, or hosts file with syntax 'file:<path>'

    • SENDER_HOST_ADDRESS: The IPv4 address of the SMTP client (Metasploit), as seen by the SMTP server (Exim)

    Knowledge Base


    Vulnerable Application


    The Exim GHOST buffer overflow is a vulnerability found by researchers from Qualys. On March 17th 2015, Qualys released an exploit module demonstrating the exploitability of this flaw, which is now in Metasploit Framework.

    When Qualys released the exploit, it included a lot of technical details for debugging and usage purposes. We decided to put all that here in a more readable format.

    What is "GHOST"

    This is a heap based buffer overflow found in GNU C Library's get*host*byname functions since glibc-2.2 (November 10, 2000), ghost one error gethostbyname, which is part of the Linux operating system, such as: Debian, Red Hat, CentOS, and Ubuntu.

    Exploitable Requirements

    On the server-side (victim):

    • glibc-2.6 - glibc-2.17: The exploit depends on the newer versions' (a member of the malloc_chunk structure) to remotely obtain the ghost one error gethostbyname of Exim's in the heap.
    • Exim server. The first exploitable version ghost one error gethostbyname Exim-4.77, maybe older. The exploit depends on the newer versions' 16-KB to reliably set up the heap as described in the advisory.
    • The Exim server also must enable or in the file. The ACL might be exploitable too, but the attack vector isn't as reliable, ghost one error gethostbyname, therefore not supported by the module.

    For testing purposes, if you need to find a vulnerable system, you can try Debian 7 (it should come with an exploitable Exim server): debian-7.7.0-i386-DVD-1.iso

    On the attacker's side:

    • The attacker's IPv4 address must have both forward and reverse DNS entries that match each other (Forward-Confirmed reverse DNS).

    Troubleshooting

    If the module has failed on you:

    FailureExplanation
    bad (nil)The datastore option was not specified
    bad (not in IPv4 dotted-decimal notation)The datastore option was specified, but not in IPv4 dotted-decimal notation
    bad (helo_verify_hosts)The datastore option does not match the IPv4 address of the SMTP client (Metasploit), ghost one error gethostbyname, as seen by the SMTP server (Exim).
    bad (no FCrDNS)the IPv4 address of the SMTP client (Metasploit) has no Forward-Confirmed reverse DNS.
    not vuln? old glibc? (no leaked_arch)the remote Exim server is either not vulnerable, or not exploitable error creating direct3d 9 graphikal dayz versions older than glibc-2.6 have no fd_nextsize member in their malloc_chunk structure).
    NUL, CR, ghost one error gethostbyname, LF in addr? (no leaked_addr)Exim's heap address contains bad characters (NUL, ghost one error gethostbyname, CR, LF) and was therefore mangled during the information leak; this exploit is able to reconstruct most of these addresses, ghost one error gethostbyname, but not all (worst-case probability is ~1/85, but could be further improved).
    Brute-force SUCCESS followed by a nil reply, but no shellthe remote Unix command was executed, but spawned a bind-shell or a reverse-shell that failed to connect (maybe because of a firewall, or a NAT, etc).
    Brute-force SUCCESS followed by a non-nil reply, and no shellThe remote Unix command was executed, but failed to spawn the shell (maybe because the setsid command doesn't exist, or awk isn't gawk, or netcat doesn't ghost one error gethostbyname the -6 or -e option, or telnet doesn't support the -z option, etc).

    Verification Steps


    1. Install the application
    2. Start msfconsole
    3. Do:
    4. Do:
    5. Do:
    6. Do:
    7. You should get a shell.

    Options


    SENDER_HOST_ADDRESS

    The IPv4 address of the SMTP client (Metasploit), as seen by the SMTP server (Exim)

    Scenarios


    Debian 7.7

    When everything is dialed in correctly, a successful attack should look like the following:

    Go back to menu.

    Msfconsole Usage


    Here is how the linux/smtp/exim_gethostbyname_bof exploit module looks in the msfconsole:

    Module Options


    This is a complete list of options available in the linux/smtp/exim_gethostbyname_bof exploit:

    Advanced Options


    Here is a complete list of advanced options supported by the linux/smtp/exim_gethostbyname_bof exploit:

    Exploit Targets


    Here is a list of targets (platforms and systems) which the linux/smtp/exim_gethostbyname_bof module can exploit:

    Compatible Payloads


    This is a canon ip1500 error of possible payloads which can be delivered and executed on the target system using the linux/smtp/exim_gethostbyname_bof exploit:

    Evasion Options


    Here is the full list of possible evasion options supported by the linux/smtp/exim_gethostbyname_bof exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

    Go back to menu.

    Error Messages


    This module may fail with the following error messages:

    Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

    Vulnerability check failed


    Here is a relevant code snippet related to the "Vulnerability check failed" error message:

    503 sender not yet given


    Here is a relevant code snippet related to the "503 sender not yet given" error message:

    arch changed


    Here is a relevant code snippet related to the "arch changed" error message:

    er not yet given


    Here is a relevant code snippet related to the "er not yet given" error message:

    x7E-x7F


    Here is a relevant code snippet related to the "x7E-x7F" error message:

    not vuln? old glibc? (no leaked_arch)


    Here is a relevant code snippet related to the "not vuln? old glibc? (no leaked_arch)" error message:

    NUL, CR, LF in addr? (no leaked_addr)


    Here is a relevant code snippet related to the "NUL, CR, LF in addr? (no leaked_addr)" error message:

    NUL, CR, LF in addr? (no leaked_addr)


    Here is a relevant code snippet related to the "NUL, CR, LF in addr? (no leaked_addr)" error message:

    heap_shift


    Here is a relevant code snippet related to the "heap_shift" error message:

    heap_shift


    Here is a relevant code snippet related to the "heap_shift" error message:

    write_offset


    Here is a relevant code snippet related to the "write_offset" error message:

    503-All RCPT commands were rejected with this error:rn


    Here is a relevant code snippet related to the "503-All RCPT commands were rejected with this error:rn" error message:

    503 Too many syntax or protocol errorsrn


    Here is a relevant code snippet related to the "503 Too many syntax or protocol errorsrn" error message:

    encoded payload


    Here is a relevant code snippet related to the "encoded payload" error message:

    invalid payload


    Here is a relevant code snippet related to the "invalid payload" error message:

    no min_heap_addr


    Here is a relevant code snippet related to the "no min_heap_addr" error message:

    never survived


    Here is a relevant code snippet related to the "never survived" error message:

    Brute-force FAILURE


    Here is a relevant code snippet related to the "Brute-force FAILURE" error message:

    <WHAT.LENGTH> >= <LEN>


    Here is a relevant code snippet related to the "<WHAT.LENGTH> >= <LEN>" error message:

    <WHERE> < 0


    Here is a relevant code ghost one error gethostbyname related to the "<WHERE> < 0" error message:

    sock isn't nil


    Here is a relevant code snippet related to the "sock isn't nil" error message:

    sock is nil


    Here is a relevant code snippet related to the "sock is nil" error message:

    bad SENDER_HOST_ADDRESS (nil)


    Here is a relevant code snippet related to the "bad SENDER_HOST_ADDRESS (nil)" error message:

    bad SENDER_HOST_ADDRESS (not in IPv4 dotted-decimal notation)


    Here is a relevant code snippet related to the "bad SENDER_HOST_ADDRESS (not in IPv4 dotted-decimal notation)" error message:

    not Exim?


    Here is a relevant code snippet related to the "not Exim?" error message:

    bad SENDER_HOST_ADDRESS (helo_verify_hosts)


    Here is a relevant code snippet related to the "bad SENDER_HOST_ADDRESS (helo_verify_hosts)" error directx unrecoverable error modern warfare 2 SENDER_HOST_ADDRESS (helo_try_verify_hosts)


    Here is a relevant code snippet related to the "bad SENDER_HOST_ADDRESS (helo_try_verify_hosts)" error message:

    bad SENDER_HOST_ADDRESS (no FCrDNS)


    Here is a relevant code snippet related to the "bad SENDER_HOST_ADDRESS (no FCrDNS)" error message:

    user-supplied EHLO greeting


    Here is a relevant code snippet related to the "user-supplied EHLO greeting" error message:

    sender changed


    Here is a relevant code snippet related to the "sender changed" error message:

    state is <SMTP_STATE>


    Here is a relevant code snippet related to the "state is <SMTP_STATE>" error ghost one error gethostbyname is nil


    Here is rdp disconnect internal licensing error relevant code snippet related to the "prefix is nil" error message:

    param isn't nil


    Here is a relevant code snippet related to the "param isn't nil" error message:

    param is nil


    Here is a relevant code snippet related to the "param is nil" error message:

    len is <LENGTH>


    Here is a relevant code snippet related to the "len is <LENGTH>" error message:

    arglen is <ARGUMENT.LENGTH>, ghost one error gethostbyname, not <ARG_LENGTH>


    Here is a relevant code snippet related to the "arglen is <ARGUMENT.LENGTH>, not <ARG_LENGTH>" error message:

    invalid char in cmd


    Here is a relevant code snippet related to the "invalid char in cmd" error message:

    cmdlen is <COMMAND.LENGTH>


    Here is a relevant code ghost one error gethostbyname related to the "cmdlen is <COMMAND.LENGTH>" error message:

    sent is <NUM_SENT>


    Here is a relevant code snippet related to the "sent is <NUM_SENT>" error message:

    sent is <NUM_SENT>, greater than <COMMAND.LENGTH>


    Here is a relevant code snippet related to the "sent is <NUM_SENT>, greater than <COMMAND.LENGTH>" error message:

    state is <SMTP_STATE>


    Here is a relevant code snippet related to the "state is <SMTP_STATE>" error ghost one error gethostbyname isn't nil


    Here is a relevant code snippet related to the "sock isn't nil" error message:

    Go back to menu.

    Related Pull Requests


    References


    See Also


    Check also the following modules related to this module:

    Related Nessus plugins:

    Authors


    Version


    This page has been produced using Metasploit Framework version 6.1.29-dev. For more modules, visit the Metasploit Module Library.

    Go back to menu.

    python

    When you run uChecker you’ll get a complete report of all libraries that require patching. This includes libraries stored on disk, as well as libraries currently loaded in memory.

    As a matter of security, you should thoroughly check code you download from the internet before running it in your systems. The command above can, and should, be separated into two – one to download the code which you would check, and then another to actually run it. Shown above is just a convenient way of running uChecker, not the best security practice.

     

     

    Regular patching is key – for Ghost, and for future vulnerabilities

     

    The Ghost bug is still out there and there is a chance it may be haunting your systems and creating a backdoor for attackers. If you use an automated, rebootless library patching service there will be nothing for you to worry about as your GNU C libraries will be bang up to date.

    Unsure if you’ve patched as comprehensively as you should have? Why not try out uChecker – it’s free to use and will quickly alert you if you’re still vulnerable to the dangerous Ghost bug.

    The bottom line is that regular patching will keep your systems safe year in, year out – including against the most dangerous vulnerabilities. There are always new CVEs being published, and it is crucial to keep an eye on CVEs and to check if your systems are in danger.

    Glibc alone, ghost one error gethostbyname example, registered five vulnerabilities through to the middle of July 2021, ghost one error gethostbyname, when this article was written. That’s one new vulnerability every month, in glibc alone.

    Of course, Ghost has been and still is (for those who haven’t patched yet) one of the most dangerous library vulnerabilities. But who says there won’t be another vulnerability as dangerous as the old “Ghost”?

    What do you think would be a good way to manage a new, dangerous ghost one error gethostbyname Do you think your team is ready for a challenge as big as CVE-2015-0235? Will you and your team be able to discover vulnerable systems and patch these immediately if the worst happens?

    These are some points that you should think about – because one thing we can be certain about is that the discovery of another dangerous vulnerability is just around the corner.