SB2020022025 - Input validation error in FreeBSD
Published: February 20, 2020 Updated: July 17, 2020
Security Bulletin ID
SB2020022025
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 security vulnerability.
1) Input validation error (CVE-ID: CVE-2015-2923)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in FreeBSD through 10.1 allows remote attackers to reconfigure a hop-limit setting via a small hop_limit value in a Router Advertisement (RA) message.
Remediation
Install update from vendor's website.
References
- http://openwall.com/lists/oss-security/2015/04/04/2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6fd99094de2b83d1d4c8457f2c83483b2828e75a
- https://lists.freebsd.org/pipermail/freebsd-net/2015-April/041934.html
- https://www.freebsd.org/security/advisories/FreeBSD-SA-15:09.ipv6.asc