[arch-security] [ASA-201503-22] cpio: directory traversal

[Levente Polyak]

Arch Linux Security Advisory ASA-201503-22
==========================================

Severity: Low
Date    : 2015-03-23
CVE-ID  : CVE-2015-1197
Package : cpio
Type    : directory traversal
Remote  : No
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package cpio before version 2.11-6 is vulnerable to directory traversal.

Resolution
==========

Upgrade to 2.11-6.

# pacman -Syu "cpio>=2.11-6"

The problem has not been fixed upstream but patches were available.

Workaround
==========

None.

Description
===========

It was reported that cpio is vulnerable to a directory traversal
vulnerability when using the --no-absolute-filenames option. While
extracting an archive, it will extract symlinks and then follow them if
they are referenced in further entries. This can be exploited by a rogue
archive to write to files outside the current directory.

Impact
======

An attacker is able to use a specially crafted archive containing a
symlink to perform directory traversal resulting in arbitrary file write.

References
==========

https://lists.gnu.org/archive/html/bug-cpio/2015-01/msg00000.html
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1197
https://bugs.archlinux.org/task/44173

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