Security Information / 2013 / Security Information -- DSA-2666-1 xen

Debian Security Advisory

DSA-2666-1 xen -- several vulnerabilities

Date Reported:

12 May 2013

Affected Packages:

xen

Vulnerable:

Yes

Security database references:

In Mitre's CVE dictionary: CVE-2013-1918, CVE-2013-1952, CVE-2013-1964.

More information:

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:

• CVE-2013-1918

  (XSA 45) several long latency operations are not preemptible.

  Some page table manipulation operations for PV guests were not made preemptible, allowing a malicious or buggy PV guest kernel to mount a denial of service attack affecting the whole system.

• CVE-2013-1952

  (XSA 49) VT-d interrupt remapping source validation flaw for bridges.

  Due to missing source validation on interrupt remapping table entries for MSI interrupts set up by bridge devices, a malicious domain with access to such a device can mount a denial of service attack affecting the whole system.

• CVE-2013-1964

  (XSA 50) grant table hypercall acquire/release imbalance.

  When releasing a particular, non-transitive grant after doing a grant copy operation, Xen incorrectly releases an unrelated grant reference, leading possibly to a crash of the host system. Furthermore information leakage or privilege escalation cannot be ruled out.

For the oldstable distribution (squeeze), these problems have been fixed in version 4.0.1-5.11.

For the stable distribution (wheezy), these problems have been fixed in version 4.1.4-3+deb7u1.

For the testing distribution (jessie), these problems have been fixed in version 4.1.4-4.

For the unstable distribution (sid), these problems have been fixed in version 4.1.4-4.

Note that for the stable (wheezy), testing and unstable distribution, CVE-2013-1964 (XSA 50) was already fixed in version 4.1.4-3.

We recommend that you upgrade your xen packages.