This security advisory describes one medium risk vulnerability.
1) Buffer overflow
Severity: Medium
CVSSv3: 6.6 [CVSS:3.0/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]
CVE-ID: CVE-2019-14835
CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Description
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to a boundary error within the vhost/vhost_net Linux kernel module during the live migration flow when processing dirty log entries. A privileged guest user can pass descriptors with invalid length to the host when migration is on the way, trigger buffer overflow and execute arbitrary code on the host OS.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Linux kernel: 2.6.34, 2.6.34.1, 2.6.34.2, 2.6.34.3, 2.6.34.4, 2.6.34.5, 2.6.34.6, 2.6.34.7, 2.6.34.8, 2.6.34.9, 2.6.34.10, 2.6.35, 2.6.35.1, 2.6.35.2, 2.6.35.3, 2.6.35.4, 2.6.35.5, 2.6.35.6, 2.6.35.7, 2.6.35.8, 2.6.35.9, 2.6.35.10, 2.6.35.11, 2.6.35.12, 2.6.35.13, 2.6.36, 2.6.36-rc1, 2.6.36-rc2, 2.6.36-rc3, 2.6.36.1, 2.6.36.2, 2.6.36.3, 2.6.36.4, 2.6.37, 2.6.37.1, 2.6.37.2, 2.6.37.3, 2.6.37.4, 2.6.37.5, 2.6.37.6, 2.6.38, 2.6.38.1, 2.6.38.2, 2.6.38.3, 2.6.38.4, 2.6.38.5, 2.6.38.6, 2.6.38.7, 2.6.38.8, 2.6.39, 2.6.39.1, 2.6.39.2, 2.6.39.3, 2.6.39.4, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.0.10, 3.0.11, 3.0.12, 3.0.13, 3.0.14, 3.0.15, 3.0.16, 3.0.17, 3.0.18, 3.0.19, 3.0.20, 3.0.21, 3.0.22, 3.0.23, 3.0.24, 3.0.25, 3.0.26, 3.0.27, 3.0.28, 3.0.29, 3.0.30, 3.0.31, 3.0.32, 3.0.33, 3.0.34, 3.0.35, 3.0.36, 3.0.37, 3.0.38, 3.0.39, 3.0.40, 3.0.41, 3.0.42, 3.0.43, 3.0.44, 3.0.45, 3.0.46, 3.0.47, 3.0.48, 3.0.49, 3.0.50, 3.0.51, 3.0.52, 3.0.53, 3.0.54, 3.0.55, 3.0.56, 3.0.57, 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CPE
External links
https://www.openwall.com/lists/oss-security/2019/09/17/1https://github.com/torvalds/linux/commit/060423bfdee3f8bc6e2c1bac97de24d5415e2bc4https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/commit/?h=for_linus&id=060423 ..
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