Ubuntu Security Notice USN-826-1 - 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. 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. 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.
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