This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2021-43523 →

DEBIAN-CVE-2021-43523

In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo...

Original description

The description as published by the source.

In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo, gethostbyaddr, and getnameinfo can lead to output of wrong hostnames (leading to domain hijacking) or injection into applications (leading to remote code execution, XSS, applications crashes, etc.). In other words, a validation step, which is expected in any stub resolver, does not occur.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 uclibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 uclibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 uclibc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

advisory security-tracker.debian.org