A sharutils security update is available for Gentoo Linux
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Gentoo Linux Security Advisory GLSA 200504-06
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http://security.gentoo.org/
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Severity: Normal
Title: sharutils: Insecure temporary file creation
Date: April 06, 2005
Bugs: #87939
ID: 200504-06
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Synopsis
=======
The unshar utility is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.
Background
=========
sharutils is a collection of tools to deal with shar archives.
Affected packages
================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-arch/sharutils < 4.2.1-r11 >= 4.2.1-r11
Description
==========
Joey Hess has discovered that the program unshar, which is a part of sharutils, creates temporary files in a world-writable directory with predictable names.
Impact
=====
A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When unshar is executed, this would result in the file being overwritten with the rights of the user running the utility, which could be the root user.
Workaround
=========
There is no known workaround at this time.
Resolution
=========
All sharutils users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/sharutils-4.2.1-r11"
References
=========
[ 1 ] Ubuntu Advisory
http://www.ubuntulinux.org/support/documentation/usn/usn-104-1
Availability
===========
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200504-06.xml
Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.
License
======
Copyright 2005 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200504-06
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal
Title: sharutils: Insecure temporary file creation
Date: April 06, 2005
Bugs: #87939
ID: 200504-06
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
=======
The unshar utility is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.
Background
=========
sharutils is a collection of tools to deal with shar archives.
Affected packages
================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-arch/sharutils < 4.2.1-r11 >= 4.2.1-r11
Description
==========
Joey Hess has discovered that the program unshar, which is a part of sharutils, creates temporary files in a world-writable directory with predictable names.
Impact
=====
A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When unshar is executed, this would result in the file being overwritten with the rights of the user running the utility, which could be the root user.
Workaround
=========
There is no known workaround at this time.
Resolution
=========
All sharutils users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/sharutils-4.2.1-r11"
References
=========
[ 1 ] Ubuntu Advisory
http://www.ubuntulinux.org/support/documentation/usn/usn-104-1
Availability
===========
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200504-06.xml
Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.
License
======
Copyright 2005 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
