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CVE-2020-12062

7.5 · HIGH

The scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes system call failure, which allows a malicious unprivileged user on the remote server to overwrite arb…

Published Jun 1, 2020CWE-20EPSS 2.23%

Overview

CVE-2020-12062 is a high-severity vulnerability. It was published on June 1, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 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

The scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes system call failure, which allows a malicious unprivileged user on the remote server to overwrite arbitrary files in the client's download directory by creating a crafted subdirectory anywhere on the remote server. The victim must use the command scp -rp to download a file hierarchy containing, anywhere inside, this crafted subdirectory. NOTE: the vendor points out that "this attack can achieve no more than a hostile peer is already able to achieve within the scp protocol" and "utimes does not fail under normal circumstances.

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/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1GitHubgithub.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894Refwww.openssh.com/txt/release-8.3Refwww.openwall.com/lists/oss-security/2020/05/27/1GitHubgithub.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1GitHubgithub.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894Refwww.openssh.com/txt/release-8.3Refwww.openwall.com/lists/oss-security/2020/05/27/1

How CyberStrike helps

Frequently asked questions

What is CVE-2020-12062?

CVE-2020-12062 is a high-severity vulnerability. It was published on June 1, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-12062?

This vulnerability has a CVSS 3.1 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-2020-12062?

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-2020-12062?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-12062 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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