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CAN-2004-0083: Buffer overflow in ReadFontAlias from dirfile.c of
XFree86 4.1.0 through 4.3.0 allows local users and remote attackers to
execute arbitrary code via a font alias file (font.alias) with a long
token, a different vulnerability than CAN-2004-0084.
CAN-2004-0084: Buffer overflow in the ReadFontAlias function in XFree86
4.1.0 to 4.3.0, when using the CopyISOLatin1Lowered function, allows
local or remote authenticated users to execute arbitrary code via a
malformed entry in the font alias (font.alias) file, a different
vulnerability than CAN-2004-0083.
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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Debian Security Advisory DSA 443-1 security@debian.org
http://www.debian.org/security/ Matt Zimmerman
February 19th, 2004 http://www.debian.org/security/faq
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Package : xfree86
Vulnerability : several
Problem-Type : remote
Debian-specific: no
CVE Ids : CAN-2003-0690 CAN-2004-0083 CAN-2004-0084 CAN-2004-0106 CAN-2004-0093 CAN-2004-0094
A number of vulnerabilities have been discovered in XFree86:
CAN-2004-0083: Buffer overflow in ReadFontAlias from dirfile.c of
XFree86 4.1.0 through 4.3.0 allows local users and remote attackers to
execute arbitrary code via a font alias file (font.alias) with a long
token, a different vulnerability than CAN-2004-0084.
CAN-2004-0084: Buffer overflow in the ReadFontAlias function in XFree86
4.1.0 to 4.3.0, when using the CopyISOLatin1Lowered function, allows
local or remote authenticated users to execute arbitrary code via a
malformed entry in the font alias (font.alias) file, a different
vulnerability than CAN-2004-0083.
CAN-2004-0106: Miscellaneous additional flaws in XFree86's handling of
font files.
CAN-2003-0690: xdm does not verify whether the pam_setcred function call
succeeds, which may allow attackers to gain root privileges by
triggering error conditions within PAM modules, as demonstrated in
certain configurations of the MIT pam_krb5 module.
CAN-2004-0093, CAN-2004-0094: Denial-of-service attacks against the X
server by clients using the GLX extension and Direct Rendering
Infrastructure are possible due to unchecked client data (out-of-bounds
array indexes [CAN-2004-0093] and integer signedness errors
[CAN-2004-0094]).
Exploitation of CAN-2004-0083, CAN-2004-0084, CAN-2004-0106,
CAN-2004-0093 and CAN-2004-0094 would require a connection to the X
server. By default, display managers in Debian start the X server
with a configuration which only accepts local connections, but if the
configuration is changed to allow remote connections, or X servers are
started by other means, then these bugs could be exploited remotely.
Since the X server usually runs with root privileges, these bugs could
potentially be exploited to gain root privileges.
No attack vector for CAN-2003-0690 is known at this time.
For the stable distribution (woody) these problems have been fixed in
version 4.1.0-16woody3.
For the unstable distribution (sid) these problems have been fixed in
version 4.3.0-2.
We recommend that you update your xfree86 package.
Upgrade Instructions
- --------------------
wget url
will fetch the file for you
dpkg -i file.deb
will install the referenced file.
If you are using the apt-get package manager, use the line for
sources.list as given below:
apt-get update
will update the internal database
apt-get upgrade
will install corrected packages
You may use an automated update by adding the resources from the
footer to the proper configuration.
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