CVE-2021-3999 Information

Description

A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.

Reference

https://www.openwall.com/lists/oss-security/2022/01/24/4 https://access.redhat.com/security/cve/CVE-2021-3999 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e https://sourceware.org/bugzilla/show_bug.cgi?id=28769 https://security-tracker.debian.org/tracker/CVE-2021-3999 https://bugzilla.redhat.com/show_bug.cgi?id=2024637