SB2018111929 - Improper input validation in pdns-recursor (Alpine package)
Published: November 19, 2018
Security Bulletin ID
SB2018111929
Severity
Low
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) Improper input validation (CVE-ID: CVE-2018-14644)
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to an error if the parent zone is signed, and all the authoritative servers for that parent zone answer with FORMERR to a query for at least one of the meta-types. A remote attacker can send a DNS query for a meta-type like OPT, lead to a zone being wrongly cached as failing DNSSEC validation and cause subsequent queries from clients to request DNSSEC validation answered with a ServFail.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=25d9fe89a4cbd43e9f7cc3e4f9c28cf372f28c57
- https://git.alpinelinux.org/aports/commit/?id=08ec10f083f3eb9549ad5efb4acdbe2c313bc4c2
- https://git.alpinelinux.org/aports/commit/?id=a82df6a94c042f4bf27b6d162cda7fb7d7f513b5
- https://git.alpinelinux.org/aports/commit/?id=d4b0f51ac1e8c9d50821593f4982da6bdb1c68a5
- https://git.alpinelinux.org/aports/commit/?id=0756f3f95a7b96bfe212a78d42d64da35b03a78a