SB2021012421 - Buffer overflow in xen (Alpine package)
Published: January 24, 2021
Security Bulletin ID
SB2021012421
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Buffer overflow (CVE-ID: CVE-2020-27674)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local authenticated user to read and manipulate data.
An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=b7415ec9fb42dde32333fbc1e4575f6bcf11cb32
- https://git.alpinelinux.org/aports/commit/?id=7c351cb852f0cee887b3fcb3a76be20f51350a1a
- https://git.alpinelinux.org/aports/commit/?id=b47f6b6f2e6b179714227cc362a24b0bdb78a028
- https://git.alpinelinux.org/aports/commit/?id=7335a7d4162b6694682183dfea682f282843d5f3
- https://git.alpinelinux.org/aports/commit/?id=91c8694f2fdbc9ff757dc2f658107b9a87428d10