Linux Kernel up to 5.6.10 XFS v5 Image xfs_alloc.c resource consumption

Summaryinfo

A vulnerability has been found in Linux Kernel up to 5.6.10 and classified as problematic. This affects an unknown function in the library fs/xfs/libxfs/xfs_alloc.c of the component XFS v5 Image Handler. The manipulation leads to resource consumption. This vulnerability is referenced as CVE-2020-12655. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.6.10 (Operating System). It has been rated as problematic. This issue affects an unknown part in the library fs/xfs/libxfs/xfs_alloc.c of the component XFS v5 Image Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.

The weakness was published 05/05/2020. The identification of this vulnerability is CVE-2020-12655 since 05/05/2020. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 208602 (CentOS 7 : kernel-alt (RHSA-2020:3545)), 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 (208602). Similar entries are available at VDB-154748, VDB-154747, VDB-154746 and VDB-154744. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.6.0
• 5.6.1
• 5.6.2
• 5.6.3
• 5.6.4
• 5.6.5
• 5.6.6
• 5.6.7
• 5.6.8
• 5.6.9
• 5.6.10

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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

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