Gentoo Linux Advisories: Shorewall, libpng

http://security.gentoo.org/

Severity: Normal
Title: Shorewall : Insecure temp file handling
Date: July 08, 2004
Bugs: #55675
ID: 200407-07

Synopsis

Shorewall contains a bug in the code handling the creation of temporary files and directories. This can allow a non-root user to overwrite arbitrary system files.

Background

Shorewall is a high level tool for configuring Netfilter, the firewall facility included in the Linux Kernel.

Affected packages

Description

Shorewall uses temporary files and directories in an insecure manner. A local user could create symbolic links at specific locations, eventually overwriting other files on the filesystem with the rights of the shorewall process.

Impact

An attacker could exploit this vulnerability to overwrite arbitrary system files with root privileges, resulting in Denial of Service or further exploitation.

Workaround

There is no known workaround at this time. All users should upgrade to the latest available version of Shorewall.

Resolution

All users should upgrade to the latest available version of Shorewall, as follows:

    # emerge sync
    # emerge -pv ">=net-firewall/shorewall-1.4.10f"
    # emerge ">=net-firewall/shorewall-1.4.10f"

References

[ 1 ] Shorewall Announcement

http://lists.shorewall.net/pipermail/shorewall-announce/2004-June/000385.html

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200407-07.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 2004 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/1.0

http://security.gentoo.org/

Severity: Normal
Title: libpng: Buffer overflow on row buffers
Date: July 08, 2004
Bugs: #56307
ID: 200407-06

Synopsis

libpng contains a buffer overflow vulnerability potentially allowing an attacker to perform a Denial of Service attack or even execute arbitrary code.

Background

libpng is a standard library used to process PNG (Portable Network Graphics) images. It is used by several other programs, including web browsers and potentially server processes.

Affected packages

Description

Due to a wrong calculation of loop offset values, libpng contains a buffer overflow vulnerability on the row buffers. This vulnerability was initially patched in January 2003 but since it has been discovered that libpng contains the same vulnerability in two other places.

Impact

An attacker could exploit this vulnerability to cause programs linked against the library to crash or execute arbitrary code with the permissions of the user running the vulnerable program, which could be the root user.

Workaround

There is no known workaround at this time. All users are encouraged to upgrade to the latest available version.

Resolution

All libpng users should upgrade to the latest stable version:

    # emerge sync
    # emerge -pv ">=media-libs/libpng-1.2.5-r7"
    # emerge ">=media-libs/libpng-1.2.5-r7"

You should also run revdep-rebuild to rebuild any packages that depend on older versions of libpng :

# revdep-rebuild

References

[ 1 ] CAN-2002-1363

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1363

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200407-06.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 2004 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/1.0