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UnAce: Buffer overflow and directory traversal vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200502-32 / unace
Release Date February 28, 2005
Latest Revision May 19, 2014: 2
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
app-arch/unace <= 2.5-r3 >= 2.5-r3 All supported architectures

Related bugreports: #81958


UnAce is vulnerable to several buffer overflow and directory traversal attacks.

2.  Impact Information


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


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).


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

3.  Resolution Information


There is no known workaround at this time.


All UnAce users should upgrade to the latest available version:

Code Listing 3.1: Resolution

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

4.  References


Page updated February 28, 2005

Summary: This is a Gentoo Linux Security Advisory

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