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GLSA-200504-06 : sharutils: Insecure temporary file creation

medium Nessus Plugin ID 17993

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-200504-06 (sharutils: Insecure temporary file creation)

 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.

Solution

All sharutils users should upgrade to the latest version:
 # emerge --sync # emerge --ask --oneshot --verbose '>=app-arch/sharutils-4.2.1-r11'

See Also

https://www.ubuntu.com/support/documentation/usn/usn-104-1

https://security.gentoo.org/glsa/200504-06

Plugin Details

Severity: Medium

ID: 17993

File Name: gentoo_GLSA-200504-06.nasl

Version: 1.16

Type: local

Published: 4/7/2005

Updated: 1/6/2021

Supported Sensors: Nessus

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:sharutils, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Patch Publication Date: 4/6/2005

Reference Information

GLSA: 200504-06