Systemd-coredump: race condition that allows a local attacker to crash a suid program and gain read access to the resulting core dump

A vulnerability was found in systemd-coredump. This flaw allows an attackerto force a SUID process to crash and replace it with a non-SUID binary toaccess the original's privileged process coredump, allowing the attacker toread sensitive data, such as /etc/shadow content, loaded by the originalprocess.A SUID binary or process has a special type of permission, which allows theprocess to run with the file owner's permissions, regardless of the userexecuting the binary. This allows the process to access more restricteddata than unprivileged users or processes would be able to. An attacker canleverage this flaw by forcing a SUID process to crash and force the Linuxkernel to recycle the process PID before systemd-coredump can analyze the/proc/pid/auxv file. If the attacker wins the race condition, they gainaccess to the original's SUID process coredump file. They can readsensitive content loaded into memory by the original binary, affecting dataconfidentiality.

Where it's fixed