Xen xenstored resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Xen. Affected by this vulnerability is an unknown functionality of the component xenstored. Performing a manipulation results in resource consumption. This vulnerability is cataloged as CVE-2022-42313. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Xen (Virtualization Software) (affected version unknown). This affects an unknown functionality of the component xenstored. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

Xenstore: guests can let run xenstored out of memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Malicious guests can cause xenstored to allocate vast amounts of memory, eventually resulting in a Denial of Service (DoS) of xenstored. There are multiple ways how guests can cause large memory allocations in xenstored: - - by issuing new requests to xenstored without reading the responses, causing the responses to be buffered in memory - - by causing large number of watch events to be generated via setting up multiple xenstore watches and then e.g. deleting many xenstore nodes below the watched path - - by creating as many nodes as allowed with the maximum allowed size and path length in as many transactions as possible - - by accessing many nodes inside a transaction

The weakness was shared 11/01/2022. It is possible to read the advisory at xenbits.xen.org. This vulnerability is uniquely identified as CVE-2022-42313 since 10/03/2022. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 211096 (Fedora 37 : xen (2022-9f51d13fa3)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at Tenable (211096). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Virtualization Software

Name

• Xen

License

• open-source

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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