GLSA 200706-05: ClamAV: Multiple Denials of Service

http://security.gentoo.org/

Severity:	normal
Title:	ClamAV: Multiple Denials of Service
Date:	06/15/2007
Bugs:	#178082
ID:	200706-05

Synopsis

ClamAV contains several vulnerabilities leading to a Denial of Service.

Background

ClamAV is a GPL virus scanner.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-antivirus/clamav	< 0.90.3	>= 0.90.3	All supported architectures

Description

Several vulnerabilities were discovered in ClamAV by various researchers:

Victor Stinner (INL) discovered that the OLE2 parser may enter in an infinite loop (CVE-2007-2650).
A boundary error was also reported by an anonymous researcher in the file unsp.c, which might lead to a buffer overflow (CVE-2007-3023).
The file unrar.c contains a heap-based buffer overflow via a modified vm_codesize value from a RAR file (CVE-2007-3123).
The RAR parsing engine can be bypassed via a RAR file with a header flag value of 10 (CVE-2007-3122).
The cli_gentempstream() function from clamdscan creates temporary files with insecure permissions (CVE-2007-3024).

Impact

A remote attacker could send a specially crafted file to the scanner, possibly triggering one of the vulnerabilities. The two buffer overflows are reported to only cause Denial of Service. This would lead to a Denial of Service by CPU consumption or a crash of the scanner. The insecure temporary file creation vulnerability could be used by a local user to access sensitive data.

Workaround

There is no known workaround at this time.

Resolution

All ClamAV users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.90.3"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200706-05.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.