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

[GLSA]

Gentoo Linux Security Advisory

Title: unarj: Long filenames buffer overflow and a path traversal vulnerability (GLSA 200411-29)
Severity: normal
Exploitable: remote
Date: November 19, 2004
Bug(s): #70966
ID: 200411-29

Synopsis


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


Background


unarj is an ARJ archive decompressor.


Affected Packages

Package: app-arch/unarj
Vulnerable: < 2.63a-r2
Unaffected: >= 2.63a-r2
Architectures: All supported architectures


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: