Overview
CVE-2025-62875 describes an Improper Check for Unusual or Exceptional Conditions vulnerability found in OpenSMTPD. This vulnerability allows a local user to potentially crash the OpenSMTPD service, leading to a denial-of-service (DoS) condition. The affected version of OpenSMTPD impacts openSUSE Tumbleweed before version 7.8.0p0-1.1.
Technical Details
The vulnerability arises from a flaw in how OpenSMTPD handles specific unusual or exceptional conditions during its operation. By exploiting this weakness, a local attacker can trigger a condition that causes the OpenSMTPD process to terminate unexpectedly, effectively crashing the service. The precise method of exploitation isn’t specified in detail, but the nature of the “Improper Check” suggests that malformed input or an unexpected system state can lead to the crash.
More details might be available in the referenced bug reports.
CVSS Analysis
Currently, the CVSS score is listed as N/A, indicating that a formal score hasn’t been calculated or assigned yet. However, given the potential for a local denial-of-service, it is expected that a CVSS score, once determined, will reflect the impact on availability. The CVSS score would depend heavily on the ease of exploitability and scope of the impact.
Possible Impact
The primary impact of CVE-2025-62875 is a denial-of-service (DoS) condition. A successful exploit could prevent OpenSMTPD from handling incoming or outgoing email, disrupting mail services. Because the exploit requires local access, the risk is somewhat mitigated, but still significant if untrusted users have access to the affected system.
Mitigation or Patch Steps
The recommended mitigation is to upgrade OpenSMTPD to version 7.8.0p0-1.1 or later if you are running openSUSE Tumbleweed. Follow the instructions provided by openSUSE to update your system. Check the openSUSE security advisory for detailed patching instructions.
- Update your openSUSE Tumbleweed system: Use the `zypper update` command to apply the latest security patches.
- Verify the OpenSMTPD version: After the update, confirm that OpenSMTPD is running version 7.8.0p0-1.1 or later.
- Monitor OpenSMTPD: Keep an eye on system logs for any unusual activity related to OpenSMTPD.
References
SUSE Bugzilla: CVE-2025-62875
openSUSE Security Advisory: OpenSMTPD Local DoS
