SB2017061527 - Privilege escalation in xen (Alpine package)
Published: June 15, 2017
Security Bulletin ID
SB2017061527
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) Privilege escalation (CVE-ID: CVE-2017-8903)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The weakness exists due to an error in the GNTTABOP_transfer operation. A local attacker can use a specially crafted IRET hypercall, gain write access to kernel page tables and execute arbitrary code on the host OS with elevated privileges.
Successful exploitation of the vulnerability results in privilege escalation.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=2e37a309d6db43d6ec74cb76058f38a9060be22a
- https://git.alpinelinux.org/aports/commit/?id=379c5299d65499022d1f9338b6042ef5f6008b52
- https://git.alpinelinux.org/aports/commit/?id=c12d6f2d2fc4ffae930a97f25ade837b85e48808
- https://git.alpinelinux.org/aports/commit/?id=7f989732c4db2c7fa917bf58b0dd9b931dc2b9a5
- https://git.alpinelinux.org/aports/commit/?id=231b8648691a0c1f456d8f87e56bd6480fb4a0bc