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CVE-2017-17805

7.8 · HIGH

The Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does not correctly handle zero-length inputs, allowing a local attacker able to use the AF_ALG-based skcipher interface (CONFIG_CR…

Published Dec 20, 2017CWE-20EPSS 0.44%

Overview

CVE-2017-17805 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 Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does not correctly handle zero-length inputs, allowing a local attacker able to use the AF_ALG-based skcipher interface (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of service (uninitialized-memory free and kernel crash) or have unspecified other impact by executing a crafted sequence of system calls that use the blkcipher_walk API. Both the generic implementation (crypto/salsa20_generic.c) and x86 implementation (arch/x86/crypto/salsa20_glue.c) of Salsa20 were vulnerable.

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=ecaaab5649781c5a0effdaf298a925063020500eReflists.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/102291Refaccess.redhat.com/errata/RHSA-2018:2948Refaccess.redhat.com/errata/RHSA-2018:3083Refaccess.redhat.com/errata/RHSA-2018:3096

How CyberStrike helps

Frequently asked questions

What is CVE-2017-17805?

CVE-2017-17805 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-2017-17805?

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-2017-17805?

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-2017-17805?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-17805 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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