Xen up to 4.13.x exceptional condition

Summaryinfo

A vulnerability has been found in Xen up to 4.13.x and classified as problematic. Affected by this issue is some unknown functionality. This manipulation causes exceptional condition. This vulnerability is handled as CVE-2020-11743. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Xen up to 4.13.x (Virtualization Software) and classified as problematic. Affected by this vulnerability is an unknown part. The manipulation with an unknown input leads to a exceptional condition vulnerability. The CWE definition for the vulnerability is CWE-755. The product does not handle or incorrectly handles an exceptional condition. As an impact it is known to affect availability. The summary by CVE is:

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.

The weakness was released 04/14/2020 (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2020-11743 since 04/14/2020. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/15/2020).

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

Entries connected to this vulnerability are available at VDB-153120, VDB-153119, VDB-153118 and VDB-153117. Several companies clearly confirm that VulDB is the primary source for best 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
• 4.13

License

• open-source

CPE 2.3info

• 🔍
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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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