QEMU process_tx_desc() buffer overflow

qemu-processtxdesc-bo (72656) The risk level is classified as HighHigh Risk

Description:

QEMU is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the process_tx_desc() function. By sending a specially-crafted packet, a local attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.

Note: This vulnerability also affects KVM.

*CVSS:

Base Score: 4.6
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Apply the patch for this vulnerability, available from the QEMU GIT Repository. See References.

References:

  • QEMU GIT Repository: QEMU.
  • QEMU Web page: QEMU.
  • Red Hat Bugzilla Bug 772075: CVE-2012-0029 qemu-kvm: e1000: process_tx_desc legacy mode packets heap overflow.
  • XSA-6: qemu-dm Local Privilege Escalation Vulnerability.
  • BID-51642: QEMU KVM CVE-2012-0029 Local Privilege Escalation Vulnerability
  • CVE-2012-0029: Heap-based buffer overflow in the process_tx_desc function in the e1000 emulation (hw/e1000.c) in qemu-kvm 0.12, and possibly other versions, allows guest OS users to cause a denial of service (QEMU crash) and possibly execute arbitrary code via crafted legacy mode packets.
  • DSA-2396: qemu-kvm -- buffer underflow
  • DSA-2404: xen-qemu-dm-4.0 -- buffer overflow
  • OSVDB ID: 78506: Qemu hw/e1000.c process_tx_desc() Function DMA Request Legacy Packet Packet Local Overflow
  • RHSA-2012-0050: Important: qemu-kvm security, bug fix, and enhancement update
  • RHSA-2012-0051: Important: kvm security update
  • RHSA-2012-0109: Important: rhev-hypervisor6 security and bug fix update
  • RHSA-2012-0168: Important: rhev-hypervisor5 security and bug fix update
  • RHSA-2012-0370: Important: xen security and bug fix update
  • SA47740: Qemu "process_tx_desc()" Buffer Overflow Vulnerability
  • SA47741: KVM qemu-kvm "process_tx_desc()" Buffer Overflow Vulnerability
  • SA47859: Xen Qemu e1000 Privilege Escalation Vulnerability

Platforms Affected:

  • Fabrice Bellard QEMU
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Virtualization
  • RedHat RHEL Desktop Multi OS 5 Client
  • RedHat RHEL Virtualization 5 Server
  • XenSource Xen 4.0

Reported:

Jan 23, 2012

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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