Xen up to 4.12.x Bit Iteration Infinite Loop infinite loop

Summaryinfo

A vulnerability was found in Xen up to 4.12.x. It has been rated as problematic. This vulnerability affects unknown code of the component Bit Iteration Handler. This manipulation as part of Infinite Loop causes infinite loop. This vulnerability is tracked as CVE-2019-19582. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in Xen up to 4.12.x (Virtualization Software). Affected by this vulnerability is an unknown function of the component Bit Iteration Handler. The manipulation as part of a Infinite Loop leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. The summary by CVE is:

An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable.

The weakness was disclosed 12/11/2019. This vulnerability is known as CVE-2019-19582 since 12/04/2019. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-147008, VDB-147006, VDB-147005 and VDB-147004 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Virtualization Software

Name

• Xen

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

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