QEMU up to 5.0.0 SM501 Display Driver hw/display/sm501.c sm501_2d_engine_write integer overflow

Summaryinfo

A vulnerability has been found in QEMU up to 5.0.0 and classified as critical. Affected by this vulnerability is the function sm501_2d_engine_write of the file hw/display/sm501.c of the component SM501 Display Driver. The manipulation leads to integer overflow. This vulnerability is uniquely identified as CVE-2020-12829. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in QEMU up to 5.0.0 (Virtualization Software) and classified as critical. This issue affects the function sm501_2d_engine_write of the file hw/display/sm501.c of the component SM501 Display Driver. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In QEMU through 5.0.0, an integer overflow was found in the SM501 display driver implementation. This flaw occurs in the COPY_AREA macro while handling MMIO write operations through the sm501_2d_engine_write() callback. A local attacker could abuse this flaw to crash the QEMU process in sm501_2d_operation() in hw/display/sm501.c on the host, resulting in a denial of service.

The weakness was disclosed 08/31/2020 (Website). The advisory is shared at usn.ubuntu.com. The identification of this vulnerability is CVE-2020-12829 since 05/13/2020. An attack has to be approached locally. A simple authentication is necessary for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/26/2024).

The vulnerability scanner Nessus provides a plugin with the ID 209571 (Oracle Linux 8 : virt:kvm_utils3 (ELSA-2024-12792)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (209571). The entry VDB-160360 is pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Virtualization Software

Name

• QEMU

Version

• 5.0

License

• open-source

Website

• Product: https://www.qemu.org/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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