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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