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CVE-2015-6564

7.0 · HIGH

Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging cont…

Published Aug 24, 2015openbsdCWE-264EPSS 0.60%

Overview

CVE-2015-6564 is a high-severity vulnerability affecting openbsd openssh. It was published on August 24, 2015 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request.

Remediation

Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. 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.

Affected products

VendorProductVersionsStatus
openbsdopenssh0Affected

References

Reflists.fedoraproject.org/pipermail/package-announce/2015-August/165170.htmlReflists.opensuse.org/opensuse-security-announce/2015-09/msg00017.htmlRefrhn.redhat.com/errata/RHSA-2016-0741.htmlRefseclists.org/fulldisclosure/2015/Aug/54Refwww.openssh.com/txt/release-7.0Refwww.openwall.com/lists/oss-security/2015/08/22/1Refwww.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.htmlRefwww.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlRefwww.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.htmlRefwww.securityfocus.com/bid/76317

How CyberStrike helps

Frequently asked questions

What is CVE-2015-6564?

CVE-2015-6564 is a high-severity vulnerability affecting openbsd openssh. It was published on August 24, 2015 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2015-6564?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2015-6564?

Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. 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-2015-6564?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-6564 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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