medium
6.5
CWE
770
Advisory Published
Updated

CVE-2022-42317

First published: Tue Nov 01 2022(Updated: )

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

Credit: security@xen.org

Affected SoftwareAffected VersionHow to fix
debian/xen<=4.11.4+107-gef32c7afa2-1
4.14.6-1
4.14.5+94-ge49571868d-1
4.17.1+2-gb773c48e36-1
4.17.2+55-g0b56bed864-1
Xen Xen
Debian Debian Linux=11.0
Fedoraproject Fedora=35
Fedoraproject Fedora=36
Fedoraproject Fedora=37

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Reference Links

Frequently Asked Questions

  • What is CVE-2022-42317?

    CVE-2022-42317 is a vulnerability in Xen that allows malicious guests to cause xenstored to allocate vast amounts of memory, leading to a Denial of Service (DoS) attack.

  • What is the severity of CVE-2022-42317?

    CVE-2022-42317 has a severity value of 6.5, which is considered medium.

  • How can this vulnerability be exploited?

    This vulnerability can be exploited by malicious guests running on Xen to exhaust the memory resources of xenstored, resulting in a DoS attack.

  • Which software versions are affected by CVE-2022-42317?

    The software versions affected by CVE-2022-42317 include Xen versions 4.11.4+107-gef32c7afa2-1 and earlier.

  • Where can I find more information about CVE-2022-42317?

    You can find more information about CVE-2022-42317 on the Xen Project website and the Debian Security Tracker.

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