SB2020052141 - Input validation error in pdns-recursor (Alpine package)
Published: May 21, 2020
Security Bulletin ID
SB2020052141
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2020-12244)
The vulnerability allows a remote attacker to perform a spoofing attack.
The vulnerability exists due to records in the answer section of a NXDOMAIN response lacking an SOA are not properly validated in SyncRes::processAnswer. A remote attacker with ability to perform a Man-in-the-Middle (MitM) attack can send a NXDOMAIN answer for a name that does exist and bypass DNSSEC validation.
Successful exploitation of the vulnerability may allow an attacker to perform a spoofing attack.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=5dcc709a2d71bb5090c2fdd2a78cab88d6395f1d
- https://git.alpinelinux.org/aports/commit/?id=d863fb499f4f3c153298e54046738251d8fc1af5
- https://git.alpinelinux.org/aports/commit/?id=fbfc29c6a052ada4d472ae1f42542c49ee9c5f86
- https://git.alpinelinux.org/aports/commit/?id=b553aeeff9686aba5ada03399a14cd82d7675db3
- https://git.alpinelinux.org/aports/commit/?id=4f995056d1cc52e27ae67abc42e4a53789c45fe2