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LSAT: Insecure temporary file creation

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200703-20 / lsat
Release Date March 18, 2007
Latest Revision May 11, 2007: 02
Impact low
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
app-admin/lsat < 0.9.5 >= 0.9.5 All supported architectures

Related bugreports: #159542

Synopsis

LSAT insecurely creates temporary files which can lead to symlink attacks allowing a local user to overwrite arbitrary files.

2.  Impact Information

Background

The Linux Security Auditing Tool (LSAT) is a post install security auditor which checks many system configurations and local network settings on the system for common security or configuration errors and for packages that are not needed.

Description

LSAT insecurely writes in /tmp with a predictable filename.

Impact

A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When the LSAT script is executed, this would result in the file being overwritten with the rights of the user running the software, which could be the root user.

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All lsat users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-admin/lsat-0.9.5"

4.  References



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Page updated March 18, 2007

Summary: This is a Gentoo Linux Security Advisory

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