Input validation error in QEMU - CVE-2011-1751
Published: June 21, 2012 / Updated: August 11, 2020
Vulnerability identifier: #VU43969
CSH Severity: Medium
CVSS v4: 8.5 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2011-1751
CWE-ID: CWE-20
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote #AU# to execute arbitrary code.
The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge, which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port, which leads to a use-after-free related to "active qemu timers."
Affected software
QEMU
Ubuntu
qemu-kvm (Ubuntu package)
qemu-kvm-extras (Ubuntu package)
qemu-kvm-extras-static (Ubuntu package)
Ubuntu
qemu-kvm (Ubuntu package)
qemu-kvm-extras (Ubuntu package)
qemu-kvm-extras-static (Ubuntu package)
How to mitigate CVE-2011-1751
Install update from vendor's website.
qemu-kvm (Ubuntu package) - addressed in versions 0.12.3+noroms-0ubuntu9.9, 0.12.5+noroms-0ubuntu7.5, 0.14.0+noroms-0ubuntu4.1
qemu-kvm-extras (Ubuntu package) - addressed in versions 0.12.3+noroms-0ubuntu9.9, 0.12.5+noroms-0ubuntu7.5
qemu-kvm-extras-static (Ubuntu package) - addressed in versions 0.12.3+noroms-0ubuntu9.9, 0.12.5+noroms-0ubuntu7.5
qemu-kvm-extras (Ubuntu package) - addressed in versions 0.12.3+noroms-0ubuntu9.9, 0.12.5+noroms-0ubuntu7.5
qemu-kvm-extras-static (Ubuntu package) - addressed in versions 0.12.3+noroms-0ubuntu9.9, 0.12.5+noroms-0ubuntu7.5
External References
- http://blog.nelhage.com/2011/08/breaking-out-of-kvm/
- http://git.kernel.org/?p=virt/kvm/qemu-kvm.git;a=commit;h=505597e4476a6bc219d0ec1362b760d71cb4fdca
- http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg01810.html
- http://lists.opensuse.org/opensuse-updates/2011-05/msg00043.html
- http://rhn.redhat.com/errata/RHSA-2011-0534.html
- http://secunia.com/advisories/44393
- http://secunia.com/advisories/44458
- http://secunia.com/advisories/44648
- http://secunia.com/advisories/44658
- http://secunia.com/advisories/44660
- http://secunia.com/advisories/44900
- http://www.openwall.com/lists/oss-security/2011/05/19/2
- http://www.osvdb.org/73395
- http://www.securityfocus.com/bid/47927
- https://bugzilla.redhat.com/show_bug.cgi?id=699773
- https://github.com/nelhage/virtunoid
- https://hermes.opensuse.org/messages/8572547
- https://www.ubuntu.com/usn/USN-1145-1/