CVE-2025-5054: apport — Exploit

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).

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CVSS v3.1 Score

4.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-362 CWE-362

Affected Products

Vendor	Product	Versions
canonical	apport	< 2.32.0
canonical	ubuntu_linux	All
canonical	ubuntu_linux	All
canonical	ubuntu_linux	All
canonical	ubuntu_linux	All
canonical	ubuntu_linux	All
canonical	ubuntu_linux	All
canonical	ubuntu_linux	All

References

Exploits

https://www.qualys.com/2025/05/29/apport-coredump/apport-coredump.txt

Other References

https://ubuntu.com/security/CVE-2025-5054 https://ubuntu.com/security/notices/USN-7545-1 http://seclists.org/fulldisclosure/2025/Jun/9

Frequently Asked Questions

What is CVE-2025-5054? +

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). It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2025-5054? +

CVE-2025-5054 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-5054? +

CVE-2025-5054 affects products from canonical, specifically: apport, ubuntu_linux. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-5054? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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