Is CVE-2017-17805 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 0%.

What products does CVE-2017-17805 affect?

Tracked products affected include Ubuntu, SUSE Linux Enterprise Server. Check the version you run to see whether it is affected.

How do I fix CVE-2017-17805?

Apply the vendor fix promptly. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2017-17805

Q: What is CVE-2017-17805?

CVE-2017-17805 is a high-severity software vulnerability (Improper input validation) with a CVSS score of 7.8. 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 o

HIGH severity · CVSS 7.8 · Improper input validation

7.8CVSS HIGH

Summary

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.

Impact & exploitability

Attack vectorLocal

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Exploit probability (EPSS)0%

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (2)

Ubuntu SUSE Linux Enterprise Server

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ecaaab5649781c5a0effdaf298a925063020500e ↗

CVE-2017-17805

Summary

Impact & exploitability

Affected products we track (2)

Recommendation

Additional information