UBUNTU-CVE-2020-27777
A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel.
02 / AFFECTED SOFTWARE
Affected packages
8 explicit affected versions
63 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
12 explicit affected versions
1 explicit affected versions
1 explicit affected versions
191 explicit affected versions
57 explicit affected versions
25 explicit affected versions
10 explicit affected versions
5 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
23 explicit affected versions
11 explicit affected versions
2 explicit affected versions
13 explicit affected versions
1 explicit affected versions
121 explicit affected versions
51 explicit affected versions
1 explicit affected versions
13 explicit affected versions
1 explicit affected versions
1 explicit affected versions
11 explicit affected versions
26 explicit affected versions
5 explicit affected versions
99 explicit affected versions
81 explicit affected versions
34 explicit affected versions
4 explicit affected versions
43 explicit affected versions
1 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/bd59380c5ba4147dcbaad3e582b55ccfd120b764
- https://lkml.org/lkml/2020/12/8/950
- https://ubuntu.com/security/CVE-2020-27777
- https://ubuntu.com/security/notices/USN-4679-1
- https://ubuntu.com/security/notices/USN-4680-1
- https://ubuntu.com/security/notices/USN-4708-1
- https://ubuntu.com/security/notices/USN-4751-1
- https://www.cve.org/CVERecord?id=CVE-2020-27777