GLSA 200410-31: Archive::Zip: Virus detection evasion

http://security.gentoo.org/

Severity:	low
Title:	Archive::Zip: Virus detection evasion
Date:	10/29/2004
Bugs:	#68616
ID:	200410-31

Synopsis

Email virus scanning software relying on Archive::Zip can be fooled into thinking a ZIP attachment is empty while it contains a virus, allowing detection evasion.

Background

Archive::Zip is a Perl module containing functions to handle ZIP archives.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-perl/Archive-Zip	< 1.14	>= 1.14	All supported architectures

Description

Archive::Zip can be used by email scanning software (like amavisd-new) to uncompress attachments before virus scanning. By modifying the uncompressed size of archived files in the global header of the ZIP file, it is possible to fool Archive::Zip into thinking some files inside the archive have zero length.

Impact

An attacker could send a carefully crafted ZIP archive containing a virus file and evade detection on some email virus-scanning software relying on Archive::Zip for decompression.

Workaround

There is no known workaround at this time.

Resolution

All Archive::Zip users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-perl/Archive-Zip-1.14"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200410-31.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.