Description
Race condition in Canonical apport up to and including 2.32.0 allows a local attacker to leak sensitive information via PID-reuse by leveraging namespaces. When handling a crash, the function `_check_global_pid_and_forward`, which detects if the crashing process resided in a container, was being called before `consistency_checks`, which attempts to detect if the crashing process had been replaced. Because of this, if a process crashed and was quickly replaced with a containerized one, apport could be made to forward the core dump to the container, potentially leaking sensitive information. `consistency_checks` is now being called before `_check_global_pid_and_forward`. Additionally, given that the PID-reuse race condition cannot be reliably detected from userspace alone, crashes are only forwarded to containers if the kernel provided a pidfd, or if the crashing process was unprivileged (i.e., if dump mode == 1).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Canonical Apport
Default version status: unaffected
2.20.1 to < 2.20.1-0ubuntu2.30+esm5affected2.20.9 to < 2.20.9-0ubuntu7.29+esm1affected2.20.11 to < 2.20.11-0ubuntu27.28affected2.20.11 to < 2.20.11-0ubuntu82.7affected2.28.1 to < 2.28.1-0ubuntu3.6affected2.30.0 to < 2.30.0-0ubuntu4.3affected2.32.0 to < 2.32.0-0ubuntu5.1affected2.32.0 to < 2.33.0-0ubuntu1affected2.20 to ≤ 2.32.0affected