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CVE-2008-2004

Status Candidate

Overview

The drive_init function in QEMU 0.9.1 determines the format of a raw disk image based on the header, which allows local guest users to read arbitrary files on the host by modifying the header to identify a different format, which is used when the guest is restarted.

Related Files

Ubuntu Security Notice 776-2
Posted May 13, 2009
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice USN-776-2 - USN-776-1 fixed vulnerabilities in KVM. Due to an incorrect fix, a regression was introduced in Ubuntu 8.04 LTS that caused KVM to fail to boot virtual machines started via libvirt. This update fixes the problem. Avi Kivity discovered that KVM did not correctly handle certain disk formats. A local attacker could attach a malicious partition that would allow the guest VM to read files on the VM host. Alfredo Ortega discovered that KVM's VNC protocol handler did not correctly validate certain messages. A remote attacker could send specially crafted VNC messages that would cause KVM to consume CPU resources, leading to a denial of service. Jan Niehusmann discovered that KVM's Cirrus VGA implementation over VNC did not correctly handle certain bitblt operations. A local attacker could exploit this flaw to potentially execute arbitrary code on the VM host or crash KVM, leading to a denial of service. It was discovered that KVM's VNC password checks did not use the correct length. A remote attacker could exploit this flaw to cause KVM to crash, leading to a denial of service.

tags | advisory, remote, denial of service, arbitrary, local, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2008-1945, CVE-2008-2004, CVE-2008-2382, CVE-2008-4539, CVE-2008-5714
MD5 | fd62775d76a01e0a7152815e00731ec7
Ubuntu Security Notice 776-1
Posted May 13, 2009
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice USN-776-1 - Avi Kivity discovered that KVM did not correctly handle certain disk formats. A local attacker could attach a malicious partition that would allow the guest VM to read files on the VM host. CVE-2008-2004) Alfredo Ortega discovered that KVM's VNC protocol handler did not correctly validate certain messages. A remote attacker could send specially crafted VNC messages that would cause KVM to consume CPU resources, leading to a denial of service. Jan Niehusmann discovered that KVM's Cirrus VGA implementation over VNC did not correctly handle certain bitblt operations. A local attacker could exploit this flaw to potentially execute arbitrary code on the VM host or crash KVM, leading to a denial of service. It was discovered that KVM's VNC password checks did not use the correct length. A remote attacker could exploit this flaw to cause KVM to crash, leading to a denial of service.

tags | advisory, remote, denial of service, arbitrary, local, protocol
systems | linux, ubuntu
advisories | CVE-2008-1945, CVE-2008-2004, CVE-2008-2382, CVE-2008-4539, CVE-2008-5714
MD5 | 06639815ca44a17acc0e1baa64d490e3
Mandriva Linux Security Advisory 2008-162
Posted Aug 8, 2008
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory - Multiple vulnerabilities have been found in Qemu. Multiple heap-based buffer overflows in the cirrus_invalidate_region function in the Cirrus VGA extension in QEMU 0.8.2, as used in Xen and possibly other products, might allow local users to execute arbitrary code via unspecified vectors related to attempting to mark non-existent regions as dirty, aka the bitblt heap overflow. Integer signedness error in the NE2000 emulator in QEMU 0.8.2, as used in Xen and possibly other products, allows local users to trigger a heap-based buffer overflow via certain register values that bypass sanity checks, aka QEMU NE2000 receive integer signedness error. QEMU 0.8.2 allows local users to halt a virtual machine by executing the icebp instruction. QEMU 0.8.2 allows local users to crash a virtual machine via the divisor operand to the aam instruction, as demonstrated by aam 0x0, which triggers a divide-by-zero error. The NE2000 emulator in QEMU 0.8.2 allows local users to execute arbitrary code by writing Ethernet frames with a size larger than the MTU to the EN0_TCNT register, which triggers a heap-based buffer overflow in the slirp library, aka NE2000 mtu heap overflow. Heap-based buffer overflow in QEMU 0.8.2, as used in Xen and possibly other products, allows local users to execute arbitrary code via crafted data in the net socket listen option, aka QEMU net socket heap overflow. QEMU 0.9.0 allows local users of a Windows XP SP2 guest operating system to overwrite the TranslationBlock (code_gen_buffer) buffer, and probably have unspecified other impacts related to an overflow, via certain Windows executable programs, as demonstrated by qemu-dos.com. Qemu 0.9.1 and earlier does not perform range checks for block device read or write requests, which allows guest host users with root privileges to access arbitrary memory and escape the virtual machine. Changing removable media in QEMU could trigger a bug similar to CVE-2008-2004, which would allow local guest users to read arbitrary files on the host by modifying the header of the image to identify a different format. the -usbdevice option. The drive_init function in QEMU 0.9.1 determines the format of a raw disk image based on the header, which allows local guest users to read arbitrary files on the host by modifying the header to identify a different format, which is used when the guest is restarted. The updated packages have been patched to fix these issues.

tags | advisory, overflow, arbitrary, local, root, vulnerability
systems | linux, windows, xp, mandriva
advisories | CVE-2007-1320, CVE-2007-1321, CVE-2007-1322, CVE-2007-1366, CVE-2007-5729, CVE-2007-5730, CVE-2007-6227, CVE-2008-0928, CVE-2008-1945, CVE-2008-2004
MD5 | ba2676a4e1bd86995d3d231aa78a7286
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