CVE-2020-10030: powerdns recursor Out-of-bounds Read

Vulnerability summary

CVE-2020-10030 is a high (CVSS 8.8) Out-of-bounds Read vulnerability in powerdns recursor. EPSS estimates a 23.89% chance of exploitation in the next 30 days, higher than 97.8% of scored vulnerabilities.

Timeline

1. 19-05-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does not have '\0' termination of the returned string if the hostname is larger than the supplied buffer. (Linux systems are not affected because the buffer is always large enough. OpenBSD systems are not affected because the returned hostname always has '\0' termination.) Under some conditions, this issue can lead to the writing of one '\0' byte out-of-bounds on the stack, causing a denial of service or possibly arbitrary code execution.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.