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CVE-2017-17806

7.8 · HIGH

The HMAC implementation (crypto/hmac.c) in the Linux kernel before 4.14.8 does not validate that the underlying cryptographic hash algorithm is unkeyed, allowing a local attacker able to use the AF…

Published Dec 20, 2017CWE-787EPSS 0.56%

Overview

CVE-2017-17806 is a high-severity vulnerability. It was published on December 20, 2017 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

The HMAC implementation (crypto/hmac.c) in the Linux kernel before 4.14.8 does not validate that the underlying cryptographic hash algorithm is unkeyed, allowing a local attacker able to use the AF_ALG-based hash interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel stack buffer overflow by executing a crafted sequence of system calls that encounter a missing SHA-3 initialization.

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

Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1Reflists.opensuse.org/opensuse-security-announce/2018-01/msg00006.htmlReflists.opensuse.org/opensuse-security-announce/2018-01/msg00007.htmlReflists.opensuse.org/opensuse-security-announce/2018-01/msg00008.htmlReflists.opensuse.org/opensuse-security-announce/2018-01/msg00014.htmlReflists.opensuse.org/opensuse-security-announce/2018-01/msg00016.htmlRefwww.securityfocus.com/bid/102293Refaccess.redhat.com/errata/RHSA-2018:2948GitHubgithub.com/torvalds/linux/commit/af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1Reflists.debian.org/debian-lts-announce/2018/01/msg00004.html

How CyberStrike helps

Frequently asked questions

What is CVE-2017-17806?

CVE-2017-17806 is a high-severity vulnerability. It was published on December 20, 2017 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2017-17806?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2017-17806?

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-2017-17806?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-17806 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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