cpio: Directory traversal vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200506-16 / cpio
Release Date	June 20, 2005
Latest Revision	June 20, 2005: 01
Impact	normal
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-arch/cpio	< 2.6-r3	>= 2.6-r3	All supported architectures

Related bugreports: #90619

Synopsis

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

2. Impact Information

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All cpio users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4. References

Updated June 20, 2005

Summary: This is a Gentoo Linux Security Advisory

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