PT-2017-15012 · Linux+3 · Linux Kernel+3

Published 2017-12-20 · Updated 2023-01-19 · CVE-2017-17806

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.14.8

Description The HMAC implementation in the Linux kernel does not validate that the underlying cryptographic hash algorithm is unkeyed, allowing a local attacker to cause a kernel stack buffer overflow by executing a crafted sequence of system calls that encounter a missing SHA-3 initialization. This issue affects systems that use the AF ALG-based hash interface and the SHA-3 hash algorithm.

Recommendations For Linux kernel versions prior to 4.14.8, update to version 4.14.8 or later to resolve the issue. As a temporary workaround, consider disabling the use of the SHA-3 hash algorithm until a patch is available. Restrict access to the AF ALG-based hash interface to minimize the risk of exploitation. Avoid using the CONFIG CRYPTO USER API HASH and CONFIG CRYPTO SHA3 configurations in the affected kernel versions until the issue is resolved.

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2017-2818

ALT-PU-2017-2819

CVE-2017-17806

DLA-1232-1

DSA-4073-1

DSA-4082-1

OPENSUSE-SU-2018_0022-1

OPENSUSE-SU-2018_0023-1

RHSA-2018:2948

SUSE-SU-2018:0010-1

SUSE-SU-2018:0011-1

SUSE-SU-2018:0012-1

SUSE-SU-2018:0040-1

SUSE-SU-2018:0180-1

SUSE-SU-2018:0213-1

SUSE-SU-2018:0437-1

SUSE-SU-2018:0525-1

USN-3583-1

USN-3583-2

USN-3617-1

USN-3617-2

USN-3617-3

USN-3619-1

USN-3619-2

USN-3632-1

Affected Products

Alt Linux

Linux Kernel

Suse

Ubuntu

References · 340

• https://github.com/torvalds/linux/commit/af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1 · Patch
• https://ubuntu.com/security/CVE-2017-16536 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-16537 · Vendor Advisory
• https://usn.ubuntu.com/3619-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-1000026 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-14156 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-17448 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-15274 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-7889 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3619-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-6927 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-5332 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2018:0011-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-17805 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3583-1 · Vendor Advisory