CVE-2025-4598

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

• systemd 257.6-1 (bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1106785) https://www.qualys.com/2025/05/29/apport-coredump/apport-coredump.txt For a comprehensive fix a kernel change is required (to hand a pidfd to the usermode coredump helper): https://git.kernel.org/linus/b5325b2a270fcaf7b2a9a0f23d422ca8a5a8bdea Backports (src:linux): https://lore.kernel.org/linux-fsdevel/CAMw=ZnT4KSk_+Z422mEZVzfAkTueKvzdw=r9ZB2JKg5-1t6BDw@mail.gmail.com/ Fixed by: https://github.com/systemd/systemd/commit/49f1f2d4a7612bbed5211a73d11d6a94fbe3bb69 (main) Fixed by: https://github.com/systemd/systemd/commit/0c49e0049b7665bb7769a13ef346fef92e1ad4d6 (main) Fixed by: https://github.com/systemd/systemd/commit/8fc7b2a211eb13ef1a94250b28e1c79cab8bdcb9 (main) Follow up (optional): https://github.com/systemd/systemd/commit/13902e025321242b1d95c6d8b4e482b37f58cdef (main) Follow up (optional): https://github.com/systemd/systemd/commit/868d95577ec9f862580ad365726515459be582fc (main) Follow up (optional): https://github.com/systemd/systemd/commit/e6a8687b939ab21854f12f59a3cce703e32768cf (main) Follow up (optional): https://github.com/systemd/systemd/commit/76e0ab49c47965877c19772a2b3bf55f6417ca39 (main) Follow up (optional): https://github.com/systemd/systemd/commit/9ce8e3e449def92c75ada41b7d10c5bc3946be77 (main) Fixed by: https://github.com/systemd/systemd/commit/0c49e0049b7665bb7769a13ef346fef92e1ad4d6 (v258) Fixed by: https://github.com/systemd/systemd/commit/868d95577ec9f862580ad365726515459be582fc (v258) Fixed by: https://github.com/systemd/systemd/commit/c58a8a6ec9817275bb4babaa2c08e0e35090d4e3 (v257.6) Fixed by: https://github.com/systemd/systemd/commit/61556694affa290c0a16d48717b3892b85622d96 (v257.6) Fixed by: https://github.com/systemd/systemd/commit/19d439189ab85dd7222bdd59fd442bbcc8ea99a7 (v256.16) Fixed by: https://github.com/systemd/systemd-stable/commit/254ab8d2a7866679cee006d844d078774cbac3c9 (v255.21) Fixed by: https://github.com/systemd/systemd-stable/commit/7fc7aa5a4d28d7768dfd1eb85be385c3ea949168 (v254.26) Fixed by: https://github.com/systemd/systemd-stable/commit/19b228662e0fcc6596c0395a0af8486a4b3f1627 (v253.33) Fixed by: https://github.com/systemd/systemd-stable/commit/2eb46dce078334805c547cbcf5e6462cf9d2f9f0 (v252.38) Issue relates to race condition exploitable while checking if a user should be allowed to read a core file or not via the grant_user_access() function, which was introduced as part of the fix for CVE-2022-4415.