unarj: Long filenames buffer overflow and a path traversal vulnerability — GLSA 200411-29

unarj contains a buffer overflow and a directory traversal vulnerability. This could lead to overwriting of arbitrary files or the execution of arbitrary code.

Affected Packages

app-arch/unarj on all architectures
Affected versions < 2.63a-r2
Unaffected versions >= 2.63a-r2

Background

unarj is an ARJ archive decompressor.

Description

unarj has a bounds checking vulnerability within the handling of long filenames in archives. It also fails to properly sanitize paths when extracting an archive (if the "x" option is used to preserve paths).

Impact

An attacker could trigger a buffer overflow or a path traversal by enticing a user to open an archive containing specially-crafted path names, potentially resulting in the overwrite of files or execution of arbitrary code with the permissions of the user running unarj.

Workaround

There is no known workaround at this time.

Resolution

All unarj users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-arch/unarj-2.63a-r2"

References

Release Date
November 19, 2004

Latest Revision
November 19, 2004: 01

Severity
normal

Exploitable
remote

Bugzilla entries