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Mandriva Linux Security Advisory 2015-145

Mandriva Linux Security Advisory 2015-145
Posted Mar 30, 2015
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2015-145 - Ilja van Sprundel discovered that libXfont incorrectly handled font metadata file parsing. A local attacker could use this issue to cause libXfont to crash, or possibly execute arbitrary code in order to gain privileges. Ilja van Sprundel discovered that libXfont incorrectly handled X Font Server replies. A malicious font server could return specially-crafted data that could cause libXfont to crash, or possibly execute arbitrary code. The bdf parser reads a count for the number of properties defined in a font from the font file, and allocates arrays with entries for each property based on that count. It never checked to see if that count was negative, or large enough to overflow when multiplied by the size of the structures being allocated, and could thus allocate the wrong buffer size, leading to out of bounds writes. If the bdf parser failed to parse the data for the bitmap for any character, it would proceed with an invalid pointer to the bitmap data and later crash when trying to read the bitmap from that pointer. The bdf parser read metrics values as 32-bit integers, but stored them into 16-bit integers. Overflows could occur in various operations leading to out-of-bounds memory access.

tags | advisory, overflow, arbitrary, local
systems | linux, mandriva
advisories | CVE-2014-0209, CVE-2014-0210, CVE-2014-0211, CVE-2015-1802, CVE-2015-1803, CVE-2015-1804
SHA-256 | c03383e7af1d9662fd0fef548bfcc86b6af1db11d7f433937eb5eaede861ebc3

Mandriva Linux Security Advisory 2015-145

Change Mirror Download
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_______________________________________________________________________

Mandriva Linux Security Advisory MDVSA-2015:145
http://www.mandriva.com/en/support/security/
_______________________________________________________________________

Package : libxfont
Date : March 29, 2015
Affected: Business Server 2.0
_______________________________________________________________________

Problem Description:

Updated libxfont packages fix security vulnerabilities:

Ilja van Sprundel discovered that libXfont incorrectly handled font
metadata file parsing. A local attacker could use this issue to cause
libXfont to crash, or possibly execute arbitrary code in order to
gain privileges (CVE-2014-0209).

Ilja van Sprundel discovered that libXfont incorrectly handled X Font
Server replies. A malicious font server could return specially-crafted
data that could cause libXfont to crash, or possibly execute arbitrary
code (CVE-2014-0210, CVE-2014-0211).

The bdf parser reads a count for the number of properties defined
in a font from the font file, and allocates arrays with entries for
each property based on that count. It never checked to see if that
count was negative, or large enough to overflow when multiplied by
the size of the structures being allocated, and could thus allocate
the wrong buffer size, leading to out of bounds writes (CVE-2015-1802).

If the bdf parser failed to parse the data for the bitmap for any
character, it would proceed with an invalid pointer to the bitmap
data and later crash when trying to read the bitmap from that pointer
(CVE-2015-1803).

The bdf parser read metrics values as 32-bit integers, but stored them
into 16-bit integers. Overflows could occur in various operations
leading to out-of-bounds memory access (CVE-2015-1804).
_______________________________________________________________________

References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0209
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0210
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0211
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1802
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1803
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1804
http://advisories.mageia.org/MGASA-2014-0278.html
http://advisories.mageia.org/MGASA-2015-0113.html
_______________________________________________________________________

Updated Packages:

Mandriva Business Server 2/X86_64:
5bb4cda12b7ad25294e04e421142720d mbs2/x86_64/lib64xfont1-1.4.7-2.2.mbs2.x86_64.rpm
ce3365a2c8a0187f21542ce02c34909d mbs2/x86_64/lib64xfont-devel-1.4.7-2.2.mbs2.x86_64.rpm
44c27c9ceda4091972c75c148e9250d3 mbs2/SRPMS/libxfont-1.4.7-2.2.mbs2.src.rpm
_______________________________________________________________________

To upgrade automatically use MandrivaUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.

All packages are signed by Mandriva for security. You can obtain the
GPG public key of the Mandriva Security Team by executing:

gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98

You can view other update advisories for Mandriva Linux at:

http://www.mandriva.com/en/support/security/advisories/

If you want to report vulnerabilities, please contact

security_(at)_mandriva.com
_______________________________________________________________________

Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Mandriva Security Team
<security*mandriva.com>
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