SB2020041906 - Unchecked Return Value in xen (Alpine package)
Published: April 19, 2020
Security Bulletin ID
SB2020041906
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Unchecked Return Value (CVE-ID: CVE-2020-11742)
CWE-ID: CWE-252 - Unchecked Return Value
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to introduction of unexpected behavior in the fix for CVE-2017-1213 that caused bad continuation handling in GNTTABOP_copy. A remote user can crash the hypervisor.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=3992359a2b257143f6d354a15e0d3b338c5d8e45
- https://git.alpinelinux.org/aports/commit/?id=b180bcb262c13cfed0346d5b2ed0e85aa113e302
- https://git.alpinelinux.org/aports/commit/?id=5c40dfc3f9763d20de339d8f1b694b48631d253b
- https://git.alpinelinux.org/aports/commit/?id=7c4c7fb75cb36f33395f8a86ae820e4fb9f8d59e
- https://git.alpinelinux.org/aports/commit/?id=95332e4ed106c72d58a0a5490d0f608e3d76b83e
- https://git.alpinelinux.org/aports/commit/?id=fa008233b860d6652d640df8ed23f5bdd8e42b9b
- https://git.alpinelinux.org/aports/commit/?id=05b5ec57508952a3bf13538e1f72d2a5e9357796