Archive::Zip: Virus detection evasion

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200410-31 / Archive::Zip
Release Date	October 29, 2004
Latest Revision	May 22, 2006: 02
Impact	low
Exploitable	remote

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

Related bugreports: #68616

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.

2. Impact Information

Background

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

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

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

Code Listing 3.1: Resolution

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

4. References

Page updated October 29, 2004

Summary: This is a Gentoo Linux Security Advisory

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