An off-by-one error in Compress::Raw::Zlib and Compress::Raw::Bzip2 might lead to a Denial of Service.

Compress::Raw::Zlib and Compress::Raw::Bzip2 are Perl low-level interfaces to the zlib and bzip2 compression libraries.

Leo Bergolth reported an off-by-one error in the inflate() function in Zlib.xs of Compress::Raw::Zlib, possibly leading to a heap-based buffer overflow (CVE-2009-1391).

Paul Marquess discovered a similar vulnerability in the bzinflate() function in Bzip2.xs of Compress::Raw::Bzip2 (CVE-2009-1884).

A remote attacker might entice a user or automated system (for instance running SpamAssassin or AMaViS) to process specially crafted files, possibly resulting in a Denial of Service condition.

There is no known workaround at this time.

All Compress::Raw::Zlib users should upgrade to the latest version:

emerge --sync

emerge --ask --oneshot --verbose “>=perl-core/Compress-Raw-Zlib-2.020”

All Compress::Raw::Bzip2 users should upgrade to the latest version:

emerge --sync

emerge --ask --oneshot --verbose “>=perl-core/Compress-Raw-Bzip2-2.020”