CVE-2022-42324

Vulnerability Description

Oxenstored 32->31 bit integer truncation issues Integers in Ocaml are 63 or 31 bits of signed precision. The Ocaml Xenbus library takes a C uint32_t out of the ring and casts it directly to an Ocaml integer. In 64-bit Ocaml builds this is fine, but in 32-bit builds, it truncates off the most significant bit, and then creates unsigned/signed confusion in the remainder. This in turn can feed a negative value into logic not expecting a negative value, resulting in unexpected exceptions being thrown. The unexpected exception is not handled suitably, creating a busy-loop trying (and failing) to take the bad packet out of the xenstore ring.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• http://www.openwall.com/lists/oss-security/2022/11/01/10Mailing ListPatchThird Party Advisory
• http://xenbits.xen.org/xsa/advisory-420.htmlPatchVendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://security.gentoo.org/glsa/202402-07
• https://www.debian.org/security/2022/dsa-5272Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-420.txtPatchVendor Advisory
• http://www.openwall.com/lists/oss-security/2022/11/01/10Mailing ListPatchThird Party Advisory
• http://xenbits.xen.org/xsa/advisory-420.htmlPatchVendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://security.gentoo.org/glsa/202402-07
• https://www.debian.org/security/2022/dsa-5272Third Party Advisory