SB2019022801 - Privilege escalation in Linux kernel SNMP NAT module
Published: February 28, 2019
Security Bulletin ID
SB2019022801
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Privilege escalation (CVE-ID: CVE-2019-9162)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to array index error in SNMP NAT module (net/ipv4/netfilter/nf_nat_snmp_basic_main.c) when parsing ASN.1-encoded payloads in SNMP messages. A local user can set up new network namespaces that invoke iptables configuration and triggers SNMP translations, cause out-of-bounds read and write operations and execute arbitrary code on the system with elevated privileges.
Remediation
Install update from vendor's website.
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c4c07b4d6fa1f11880eab8e076d3d060ef3f55fc
- http://www.securityfocus.com/bid/107159
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1776
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.25
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.12
- https://github.com/torvalds/linux/commit/c4c07b4d6fa1f11880eab8e076d3d060ef3f55fc