Linux kernel Xen hypervisor block backend driver denial of service
| linux-kernel-xen-hypervisor-dos (42274) |  Low Risk |
Description:
Linux kernel, when running on a 64-bit host with a 32-bit paravirtualized guest, is vulnerable to a denial of service caused by the failure to perform sanity checks by the Xen hypervisor block backend driver. By sending a specially-crafted request for an overly large number of blocks, a local authenticated attacker on the Guest OS could cause the Host OS to crash.
Platforms Affected:
- Linux, Kernel 2.6.18.1
- RedHat, Enterprise Linux 5
- RedHat, Enterprise Linux 5 Server
- RedHat, Enterprise Linux 5 Client
- RedHat, Enterprise Linux Desktop 5.0
Remedy:
Refer to Red Hat Bugzilla Bug 369531 for patch, upgrade or suggested workaround information. See References.
Consequences:
Denial of Service
References:
- Red Hat Bugzilla Bug 369531, CVE-2007-5498 missing sanity check in xen block backend driver at http://rhn.redhat.com/errata/RHSA-2008-0233.html.
- The Linux Kernel Archives Web site, The Linux Kernel Archives at http://www.kernel.org/.
- BID-29082: Linux Kernel '/include/xen/blkif.h' 32-on-64 Support Denial Of Service Vulnerability
- CVE-2007-5498: The Xen hypervisor block backend driver for Linux kernel 2.6.18, when running on a 64-bit host with a 32-bit paravirtualized guest, allows local privileged users in the guest OS to cause a denial of service (host OS crash) via a request that specifies a large number of blocks.
- RHSA-2008-0233: Important: kernel security and bug fix update
Reported:
May 07, 2008
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