cpio: Directory traversal vulnerability — GLSA 200506-16

cpio contains a flaw which may allow a specially crafted cpio archive to extract files to an arbitrary directory.

Affected Packages

app-arch/cpio on all architectures
Affected versions < 2.6-r3
Unaffected versions >= 2.6-r3

Background

cpio is a file archival tool which can also read and write tar files.

Description

A vulnerability has been found in cpio that can potentially allow a cpio archive to extract its files to an arbitrary directory of the creator's choice.

Impact

An attacker could create a malicious cpio archive which would create files in arbitrary locations on the victim's system. This issue could also be used in conjunction with a previous race condition vulnerability (CAN-2005-1111) to change permissions on files owned by the victim.

Workaround

There is no known workaround at this time.

Resolution

All cpio users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-arch/cpio-2.6-r3"

References

Release Date
June 20, 2005

Latest Revision
June 20, 2005: 01

Severity
normal

Exploitable
local

Bugzilla entries