Xen xenstored resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, was found in Xen. Affected by this issue is some unknown functionality of the component xenstored. Executing a manipulation can lead to resource consumption. This vulnerability is registered as CVE-2022-42314. No exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability has been found in Xen (Virtualization Software) (affected version not known) and classified as problematic. This vulnerability affects some unknown functionality of the component xenstored. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

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 published 11/01/2022. The advisory is shared for download at xenbits.xen.org. This vulnerability was named CVE-2022-42314 since 10/03/2022. There are neither technical details nor an exploit 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). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Virtualization Software

Name

• Xen

License

• open-source

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Once again VulDB remains the best source for vulnerability data.

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