medium
5
CWE
189
Advisory Published
CVE Published
Updated

CVE-2011-2721

First published: Tue Jul 26 2011(Updated: )

An off-by-one error was found in the way the hash manager of Clam AntiVirus, a GPL anti-virus toolkit for UNIX, performed scan of messages with certain hashes. A remote attacker could provide a message with specially-crafted hash signature in it, leading to denial of service (clamscan executable crash). Upstream bug report: [1] <a href="https://wwws.clamav.net/bugzilla/show_bug.cgi?id=2818">https://wwws.clamav.net/bugzilla/show_bug.cgi?id=2818</a> Relevant patch: [2] <a href="http://git.clamav.net/gitweb?p=clamav-devel.git;a=commit;h=4842733eb3f09be61caeed83778bb6679141dbc5">http://git.clamav.net/gitweb?p=clamav-devel.git;a=commit;h=4842733eb3f09be61caeed83778bb6679141dbc5</a> Other references: [3] <a href="https://bugzilla.novell.com/show_bug.cgi?id=708263">https://bugzilla.novell.com/show_bug.cgi?id=708263</a> [4] <a href="http://git.clamav.net/gitweb?p=clamav-devel.git;a=blob_plain;f=ChangeLog;hb=clamav-0.97.2">http://git.clamav.net/gitweb?p=clamav-devel.git;a=blob_plain;f=ChangeLog;hb=clamav-0.97.2</a> [5] <a href="http://www.clamav.net/lang/en/">http://www.clamav.net/lang/en/</a>

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
ClamAV=0.95.2
ClamAV=0.86.2
ClamAV=0.88.5
ClamAV=0.02
ClamAV=0.92
ClamAV=0.95-rc2
ClamAV=0.8-rc3
ClamAV=0.15
ClamAV=0.90-rc2
ClamAV=0.75.1
ClamAV=0.65
ClamAV=0.88.7
ClamAV=0.81
ClamAV=0.86
ClamAV=0.01
ClamAV=0.92_p0
ClamAV=0.97-rc
ClamAV=0.85
ClamAV=0.84
ClamAV=0.3
ClamAV=0.91.2_p0
ClamAV=0.93.1
ClamAV=0.90-rc1.1
ClamAV=0.95.1
ClamAV=0.93
ClamAV=0.90
ClamAV=0.70-rc
ClamAV=0.86-rc1
ClamAV=0.68.1
ClamAV=0.96.4
ClamAV=0.03
ClamAV=0.87.1
ClamAV=0.9-rc1
ClamAV=0.74
ClamAV=0.93.3
ClamAV=0.88
ClamAV=0.91-rc1
ClamAV=0.86.1
ClamAV=0.71
ClamAV=0.88.1
ClamAV=0.60p
ClamAV=0.94
ClamAV=0.80-rc
ClamAV=0.91.2
ClamAV=0.96.3
ClamAV=0.90.3
ClamAV=0.85.1
ClamAV=0.90-rc1
ClamAV=0.96.2
ClamAV=0.95-src2
ClamAV=0.13
ClamAV=0.81-rc1
ClamAV=0.10
ClamAV=0.94.2
ClamAV=0.96.1
ClamAV=0.95-src1
ClamAV=0.80-rc3
ClamAV=0.90.1_p0
ClamAV=0.12
ClamAV=0.88.7_p0
ClamAV=0.23
ClamAV=0.84-rc1
ClamAV=0.90.3_p1
ClamAV=0.80-rc2
ClamAV=0.80-rc1
ClamAV=0.95
ClamAV=0.60
ClamAV=0.88.2
ClamAV=0.83
ClamAV=0.20
ClamAV=0.80-rc4
ClamAV=0.90-rc3
ClamAV=0.70
ClamAV=0.88.4
ClamAV=0.90.3_p0
ClamAV=0.14
ClamAV=0.24
ClamAV=0.96-rc2
ClamAV=0.90.2_p0
ClamAV=0.66
ClamAV=0.96.5
ClamAV=0.51
ClamAV=0.52
ClamAV=0.22
ClamAV=0.72
ClamAV=0.95-rc1
ClamAV=0.91-rc2
ClamAV=0.75
ClamAV=0.05
ClamAV=0.96
ClamAV=0.91
ClamAV=0.54
ClamAV=0.96-rc1
ClamAV=0.80
ClamAV=0.87
ClamAV=0.21
ClamAV<=0.97.1
ClamAV=0.84-rc2
ClamAV=0.88.7_p1
ClamAV=0.67-1
ClamAV=0.14-pre
ClamAV=0.90.1
ClamAV=0.91.1
ClamAV=0.95.3
ClamAV=0.88.3
ClamAV=0.97
ClamAV=0.67
ClamAV=0.92.1
ClamAV=0.90.2
ClamAV=0.68
ClamAV=0.53
ClamAV=0.93.2
ClamAV=0.88.6
ClamAV=0.94.1
ClamAV=0.80_rc
ClamAV=0.82
ClamAV=0.73

Remedy

http://www.openwall.com/lists/oss-security/2011/07/26/13

Remedy

http://www.openwall.com/lists/oss-security/2011/07/26/3

Remedy

https://bugzilla.novell.com/show_bug.cgi?id=708263

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=725694

Remedy

https://wwws.clamav.net/bugzilla/show_bug.cgi?id=2818

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2011-2721?

    CVE-2011-2721 is classified as a denial-of-service vulnerability with medium severity.

  • How can I fix CVE-2011-2721?

    To fix CVE-2011-2721, upgrade Clam AntiVirus to a version later than 0.97.1 that addresses this vulnerability.

  • What versions of ClamAV are affected by CVE-2011-2721?

    CVE-2011-2721 affects multiple versions of Clam AntiVirus including 0.95.2, 0.86.2, and other versions up to 0.97.1.

  • What kind of attacks can be carried out using CVE-2011-2721?

    An attacker can use CVE-2011-2721 to exploit an off-by-one error to create specially-crafted hash signatures that cause a denial of service.

  • Is there a workaround for CVE-2011-2721?

    While upgrading is the best solution, temporarily restricting access to the affected ClamAV services can serve as a workaround.

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