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CVE-2018-15836

7.5 · HIGH

In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification.

Published Sep 26, 2018CWE-347EPSS 1.52%

Overview

CVE-2018-15836 is a high-severity vulnerability. It was published on September 26, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51GitHubgithub.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3dReflists.openswan.org/pipermail/users/2018-August/023761.htmlGitHubgithub.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51GitHubgithub.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3dReflists.openswan.org/pipermail/users/2018-August/023761.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-15836?

CVE-2018-15836 is a high-severity vulnerability. It was published on September 26, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2018-15836?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-15836?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-15836?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-15836 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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