Archive::Zip: Virus detection evasion

Archive::Zip: Virus detection evasion 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. Archive::Zip October 29, 2004 May 22, 2006: 02 68616 remote 1.14 1.14

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

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.

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.

There is no known workaround at this time.

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


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

iDEFENSE Security Advisory 10.18.04 rt.cpan.org bug #8077 CVE-2004-1096 koon koon koon