UnAce: Buffer overflow and directory traversal vulnerabilities

Background

UnAce is an utility to extract, view and test the contents of an ACE archive.

Description

Ulf Harnhammar discovered that UnAce suffers from buffer overflows when testing, unpacking or listing specially crafted ACE archives (CAN-2005-0160). He also found out that UnAce is vulnerable to directory traversal attacks, if an archive contains “./…” sequences or absolute filenames (CAN-2005-0161).

Impact

An attacker could exploit the buffer overflows to execute malicious code or the directory traversals to overwrite arbitrary files.

Workaround

There is no known workaround at this time.

Resolution

All UnAce users should upgrade to the latest available version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-arch/unace-2.5-r3"