SB2020111082 - Input validation error in Xen
Published: November 10, 2020 Updated: December 2, 2020
Security Bulletin ID
SB2020111082
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2020-28368)
The vulnerability allows a local privileged user to gain access to sensitive information.
Xen through 4.14.x allows guest OS administrators to obtain sensitive information (such as AES keys from outside the guest) via a side-channel attack on a power/energy monitoring interface, aka a "Platypus" attack. NOTE: there is only one logically independent fix: to change the access control for each such interface in Xen.
Remediation
Install update from vendor's website.
References
- http://www.openwall.com/lists/oss-security/2020/11/26/1
- http://xenbits.xen.org/xsa/advisory-351.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5J66QUUHXH2RR4CNCKQRGVXVSOUFRPDA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XV23EZIMNLJN4YXRRXLQV2ALW6ZEALXV/
- https://platypusattack.com
- https://www.zdnet.com/article/new-platypus-attack-can-steal-data-from-intel-cpus/
- https://xenbits.xen.org/xsa/advisory-351.html