CVE-2024-45817: xen Information Disclosure — Fix

Description

In x86's APIC (Advanced Programmable Interrupt Controller) architecture, error conditions are reported in a status register. Furthermore, the OS can opt to receive an interrupt when a new error occurs. It is possible to configure the error interrupt with an illegal vector, which generates an error when an error interrupt is raised. This case causes Xen to recurse through vlapic_error(). The recursion itself is bounded; errors accumulate in the the status register and only generate an interrupt when a new status bit becomes set. However, the lock protecting this state in Xen will try to be taken recursively, and deadlock.

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CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness Type (CWE)

CWE-209 CWE-209

Affected Products

Vendor	Product	Versions
xen	xen	>= 4.5.0

References

Advisories & Patches

https://xenbits.xenproject.org/xsa/advisory-462.html http://xenbits.xen.org/xsa/advisory-462.html

Other References

http://www.openwall.com/lists/oss-security/2024/09/24/1

Frequently Asked Questions

What is CVE-2024-45817? +

In x86's APIC (Advanced Programmable Interrupt Controller) architecture, error conditions are reported in a status register. Furthermore, the OS can opt to receive an interrupt when a new error occurs. It is possible to configure the error interrupt with an illegal vector, which generates an error when an error interrupt is raised. This case causes Xen to recurse through vlapic_error(). The recursion itself is bounded; errors accumulate in the the status register and only generate an interrupt when a new status bit becomes set. However, the lock protecting this state in Xen will try to be taken recursively, and deadlock. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2024-45817? +

CVE-2024-45817 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-45817? +

CVE-2024-45817 affects products from xen, specifically: xen. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-45817? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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