CVE-2023-31130

Name of the Vulnerable Software and Affected Versions c-ares versions prior to 1.19.1

Description The issue is related to a buffer underflow in the ares inet net pton() function for certain IPv6 addresses, such as "0::00:00:00/2". This function is used internally by c-ares for configuration purposes, which would require an administrator to configure such an address via ares set sortlist(). However, users may externally use ares inet net pton() for other purposes, making them vulnerable to more severe issues.

Recommendations For versions prior to 1.19.1, update to version 1.19.1 to resolve the issue. As a temporary workaround, consider restricting the use of the ares inet net pton() function for external purposes until the update is applied. Additionally, avoid using the ares set sortlist() function to configure IPv6 addresses that may cause the buffer underflow issue.