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[Full-disclosure] [SECURITY] [DSA 2582-1] xen security update



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Debian Security Advisory DSA-2582-1                   security@xxxxxxxxxx
http://www.debian.org/security/                         Yves-Alexis Perez
December 07, 2012                      http://www.debian.org/security/faq
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Package        : xen
Vulnerability  : several
Problem type   : local
Debian-specific: no
CVE ID         : CVE-2011-3131 CVE-2012-4535 CVE-2012-4537 CVE-2012-4538 
                 CVE-2012-4539 CVE-2012-5510 CVE-2012-5513 CVE-2012-5514
                 CVE-2012-5515
Debian Bug     : 

Multiple denial of service vulnerabilities have been discovered in the xen
hypervisor. One of the issue (CVE-2012-5513) could even lead to privilege
escalation from guest to host.

Some of the recently published Xen Security Advisories (XSA 25 and 28) are not
fixed by this update and should be fixed in a future release.

CVE-2011-3131 (XSA 5): DoS using I/OMMU faults from PCI-passthrough guest

        A VM that controls a PCI[E] device directly can cause it to issue DMA
        requests to invalid addresses. Although these requests are denied by the
        I/OMMU, the hypervisor needs to handle the interrupt and clear the 
error from
        the I/OMMU, and this can be used to live-lock a CPU and potentially 
hang the
        host.

CVE-2012-4535 (XSA 20): Timer overflow DoS vulnerability

        A guest which sets a VCPU with an inappropriate deadline can cause an
        infinite loop in Xen, blocking the affected physical CPU indefinitely.

CVE-2012-4537 (XSA 22): Memory mapping failure DoS vulnerability

        When set_p2m_entry fails, Xen's internal data structures (the p2m and 
m2p
        tables) can get out of sync. This failure can be triggered by unusual 
guest
        behaviour exhausting the memory reserved for the p2m table. If it 
happens,
        subsequent guest-invoked memory operations can cause Xen to fail an 
assertion
        and crash.

CVE-2012-4538 (XSA 23): Unhooking empty PAE entries DoS vulnerability

        The HVMOP_pagetable_dying hypercall does not correctly check the
        caller's pagetable state, leading to a hypervisor crash.

CVE-2012-4539 (XSA 24): Grant table hypercall infinite loop DoS vulnerability

        Due to inappropriate duplicate use of the same loop control variable,
        passing bad arguments to GNTTABOP_get_status_frames can cause an
        infinite loop in the compat hypercall handler.

CVE-2012-5510 (XSA 26): Grant table version switch list corruption vulnerability

        Downgrading the grant table version of a guest involves freeing its 
status
        pages. This freeing was incomplete - the page(s) are freed back to the
        allocator, but not removed from the domain's tracking list. This would 
cause
        list corruption, eventually leading to a hypervisor crash.

CVE-2012-5513 (XSA 29): XENMEM_exchange may overwrite hypervisor memory

        The handler for XENMEM_exchange accesses guest memory without range 
checking
        the guest provided addresses, thus allowing these accesses to include 
the
        hypervisor reserved range.
        .
        A malicious guest administrator can cause Xen to crash. If the out of 
address
        space bounds access does not lead to a crash, a carefully crafted 
privilege
        escalation cannot be excluded, even though the guest doesn't itself 
control
        the values written.

CVE-2012-5514 (XSA 30): Broken error handling in 
guest_physmap_mark_populate_on_demand()

        guest_physmap_mark_populate_on_demand(), before carrying out its actual
        operation, checks that the subject GFNs are not in use. If that check 
fails,
        the code prints a message and bypasses the gfn_unlock() matching the
        gfn_lock() carried out before entering the loop.
        .
        A malicious guest administrator can then use it to cause Xen to hang.

CVE-2012-5515 (XSA 31): Several memory hypercall operations allow invalid 
extent order values

        Allowing arbitrary extent_order input values for 
XENMEM_decrease_reservation,
        XENMEM_populate_physmap, and XENMEM_exchange can cause arbitrarily long 
time
        being spent in loops without allowing vital other code to get a chance 
to
        execute. This may also cause inconsistent state resulting at the 
completion
        of these hypercalls.

For the stable distribution (squeeze), these problems have been fixed in
version 4.0.1-5.5.

For the testing distribution (wheezy), these problems have been fixed in
version 4.1.3-6.

For the unstable distribution (sid), these problems have been fixed in
version 4.1.3-6.

We recommend that you upgrade your xen packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx
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