CVE-2017-17806

HIGH

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.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1

http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00006.html

http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html

http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00008.html

http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00014.html

http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00016.html

http://www.securityfocus.com/bid/102293

https://access.redhat.com/errata/RHSA-2018:2948

https://github.com/torvalds/linux/commit/af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1

https://lists.debian.org/debian-lts-announce/2018/01/msg00004.html

https://usn.ubuntu.com/3583-1/

https://usn.ubuntu.com/3583-2/

https://usn.ubuntu.com/3617-1/

https://usn.ubuntu.com/3617-2/

https://usn.ubuntu.com/3617-3/

https://usn.ubuntu.com/3619-1/

https://usn.ubuntu.com/3619-2/

https://usn.ubuntu.com/3632-1/

https://www.debian.org/security/2017/dsa-4073

https://www.debian.org/security/2018/dsa-4082

https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8

Details

Source: MITRE

Published: 2017-12-20

Updated: 2018-10-31

Type: CWE-119

Risk Information

CVSS v2.0

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3.0

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH