[ GLSA 200709-14 ] ClamAV: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: ClamAV: Multiple vulnerabilities (GLSA 200709-14)
Severity: high
Exploitable: remote
Date: September 20, 2007
Bug(s): #189912
ID: 200709-14

Synopsis


Vulnerabilities have been discovered in ClamAV allowing remote execution of
arbitrary code and Denial of Service attacks.


Background


Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX,
designed especially for e-mail scanning on mail gateways.


Affected Packages

Package: app-antivirus/clamav
Vulnerable: < 0.91.2
Unaffected: >= 0.91.2
Architectures: All supported architectures


Description


Nikolaos Rangos discovered a vulnerability in ClamAV which exists
because the recipient address extracted from email messages is not
properly sanitized before being used in a call to "popen()" when
executing sendmail (CVE-2007-4560). Also, NULL-pointer dereference
errors exist within the "cli_scanrtf()" function in libclamav/rtf.c and
Stefanos Stamatis discovered a NULL-pointer dereference vulnerability
within the "cli_html_normalise()" function in libclamav/htmlnorm.c
(CVE-2007-4510).


Impact


The unsanitized recipient address can be exploited to execute arbitrary
code with the privileges of the clamav-milter process by sending an
email with a specially crafted recipient address to the affected
system. Also, the NULL-pointer dereference errors can be exploited to
crash ClamAV. Successful exploitation of the latter vulnerability
requires that clamav-milter is started with the "black hole" mode
activated, which is not enabled by default.


Workaround


There is no known workaround at this time.


Resolution


All ClamAV users should upgrade to the latest version: