Some vulnerabilities have been reported in Xen, which can be exploited by malicious, local users to bypass certain security restrictions or gain escalated privileges.
1) A vulnerability is caused due to an input validation error in tools/pygrub/src/GrubConf.py. This can be exploited by "root" users of a guest domain to execute arbitrary commands in domain 0 via specially crafted entries in grub.conf when the guest system is booted.
2) A boundary error exists within the "cirrus_invalidate_region()" function of the Cirrus video driver, which can be exploited to cause a heap-based buffer overflow.
3) The size of ethernet frames is not correctly checked against the "MTU" before being copied into the registers of the NE2000 network driver. This can be exploited to cause a heap-based buffer overflow.
4) An integer signedness error when processing data in the NE2000 device registers can be exploited to cause a heap-based buffer overflow
Note: Xen does not use the NE2000 network driver by default. Vulnerabilities 2-4 are related to: SA25073
Vulnerability #1 is reported in Xen 3.0.3. Other versions may also be affected.
Solution: Grant only trusted users "root" privileges to guest domains.
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Subject: Xen Multiple Vulnerabilities
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