USN-826-1: Mono vulnerabilities

Releases

• Ubuntu 9.04
• Ubuntu 8.10
• Ubuntu 8.04

Packages

• mono -

Details

It was discovered that the XML HMAC signature system did not correctly
check certain lengths. If an attacker sent a truncated HMAC, it could
bypass authentication, leading to potential privilege escalation.
(CVE-2009-0217)

It was discovered that Mono did not properly escape certain attributes in
the ASP.net class libraries which could result in browsers becoming
vulnerable to cross-site scripting attacks when processing the output. With
cross-site scripting vulnerabilities, if a user were tricked into viewing
server output during a crafted server request, a remote attacker could
exploit this to modify the contents, or steal confidential data (such as
passwords), within the same domain. This issue only affected Ubuntu 8.04
LTS. (CVE-2008-3422)

It was discovered that Mono did not properly filter CRLF injections in the
query string. If a user were tricked into viewing server output during a
crafted server request, a remote attacker could exploit this to modify the
contents, steal confidential data (such as passwords), or perform
cross-site request forgeries. This issue only affected Ubuntu 8.04 LTS.
(CVE-2008-3906)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 9.04

• libmono-security2.0-cil - 2.0.1-4ubuntu0.1
• libmono-system-web2.0-cil - 2.0.1-4ubuntu0.1
• libmono-system-web1.0-cil - 2.0.1-4ubuntu0.1
• libmono-security1.0-cil - 2.0.1-4ubuntu0.1

Ubuntu 8.10

• libmono-security2.0-cil - 1.9.1+dfsg-4ubuntu2.1
• libmono-system-web2.0-cil - 1.9.1+dfsg-4ubuntu2.1
• libmono-system-web1.0-cil - 1.9.1+dfsg-4ubuntu2.1
• libmono-security1.0-cil - 1.9.1+dfsg-4ubuntu2.1

Ubuntu 8.04

• libmono-security2.0-cil - 1.2.6+dfsg-6ubuntu3.1
• libmono-system-web2.0-cil - 1.2.6+dfsg-6ubuntu3.1
• libmono-system-web1.0-cil - 1.2.6+dfsg-6ubuntu3.1
• libmono-security1.0-cil - 1.2.6+dfsg-6ubuntu3.1

In general, a standard system upgrade is sufficient to effect the
necessary changes.

References

• CVE-2009-0217
• CVE-2008-3906
• CVE-2008-3422

Related notices

• USN-903-1: openoffice.org, openoffice.org-core
• USN-814-1: icedtea6-plugin, openjdk-6-jre, openjdk-6-jre-lib, openjdk-6