SB2017020923 - Resource exhaustion in Nic Knot DNS
Published: February 9, 2017 Updated: August 8, 2020
Security Bulletin ID
SB2017020923
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2016-6171)
The vulnerability allows a remote non-authenticated attacker to a crash the entire system.
Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.
Remediation
Install update from vendor's website.
References
- http://www.openwall.com/lists/oss-security/2016/07/06/3
- http://www.openwall.com/lists/oss-security/2016/07/06/4
- http://www.securityfocus.com/bid/91678
- https://github.com/sischkg/xfer-limit/blob/master/README.md
- https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWS
- https://gitlab.labs.nic.cz/labs/knot/issues/464
- https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html