CVE-2017-17806

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.04%
Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory opensuse.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://usn.ubuntu.com/3617-1/ third party advisory vendor advisory
https://usn.ubuntu.com/3619-2/ third party advisory vendor advisory
https://www.debian.org/security/2018/dsa-4082 third party advisory vendor advisory
https://usn.ubuntu.com/3617-3/ third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2018/01/msg00004.html third party advisory mailing list
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00008.html issue tracking third party advisory patch vendor advisory
https://usn.ubuntu.com/3583-2/ third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html issue tracking third party advisory patch vendor advisory
https://github.com/torvalds/linux/commit/af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1 patch
https://usn.ubuntu.com/3632-1/ third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00014.html issue tracking third party advisory patch vendor advisory
http://www.securityfocus.com/bid/102293 vdb entry third party advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1 patch
https://access.redhat.com/errata/RHSA-2018:2948 third party advisory vendor advisory
https://usn.ubuntu.com/3583-1/ third party advisory vendor advisory
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8 issue tracking release notes
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00006.html issue tracking third party advisory patch vendor advisory
https://www.debian.org/security/2017/dsa-4073 third party advisory vendor advisory
https://usn.ubuntu.com/3617-2/ third party advisory vendor advisory
https://usn.ubuntu.com/3619-1/ third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00016.html issue tracking third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-17806?
CVE-2017-17806 has been scored as a high severity vulnerability.
How to fix CVE-2017-17806?
To fix CVE-2017-17806, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-17806 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2017-17806 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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