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Bug 1528323 - (CVE-2017-17806) CVE-2017-17806 kernel: HMAC implementation does not validate that the underlying cryptographic hash algorithm is unkeyed allowing local attackers to cause denial-of-service
CVE-2017-17806 kernel: HMAC implementation does not validate that the underly...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20171129,repor...
: Security
Depends On: 1528343 1544462 1528337
Blocks: 1528324
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Reported: 2017-12-21 09:40 EST by Adam Mariš
Modified: 2018-08-28 18:28 EDT (History)
45 users (show)

See Also:
Fixed In Version: kernel 4.14.8
Doc Type: Bug Fix
Doc Text:
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. This allows 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.
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2017-12-21 09:40:03 EST
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:

https://marc.info/?t=151192100500002&r=1&w=2

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1
Comment 1 Adam Mariš 2017-12-21 10:12:39 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1528337]
Comment 3 Justin M. Forbes 2018-01-29 12:56:14 EST
This was fixed for Fedora with the 4.14.8 stable updates.
Comment 8 Eric Christensen 2018-02-13 12:01:06 EST
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, and 7, its real-time kernel and Red Hat Enterprise MRG 2.

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.

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