QEMU XGMAC Ethernet Controller hw/net/xgmac.c Packet buffer overflow

Summaryinfo

A vulnerability described as critical has been identified in QEMU. This impacts an unknown function of the file hw/net/xgmac.c of the component XGMAC Ethernet Controller. Such manipulation as part of Packet leads to buffer overflow. This vulnerability is referenced as CVE-2020-15863. The attack can only be performed from a local environment. No exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in QEMU (Virtualization Software) (unknown version) and classified as critical. Affected by this issue is an unknown code block of the file hw/net/xgmac.c of the component XGMAC Ethernet Controller. The manipulation as part of a Packet leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.

The weakness was published 07/28/2020 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2020-15863 since 07/21/2020. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

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.

Applying the patch 5519724a13664b43e225ca05351c60b4468e4555 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at Tenable (209571). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Virtualization Software

Name

• QEMU

License

• open-source

Website

• Product: https://www.qemu.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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