Bug 1528312 - (CVE-2017-17805) CVE-2017-17805 kernel: Salsa20 encryption algorithm does not correctly handle zero-length inputs allowing local attackers to cause denial-of-service
CVE-2017-17805 kernel: Salsa20 encryption algorithm does not correctly handle...
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: 1543980 1543981 1543982 1543983 1543984 1528337 1528342
Blocks: 1528313
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Reported: 2017-12-21 09:09 EST by Adam Mariš
Modified: 2018-05-29 04:28 EDT (History)
48 users (show)

See Also:
Fixed In Version: kernel 4.14.8
Doc Type: Bug Fix
Doc Text:
The Salsa20 encryption algorithm in the Linux kernel, before 4.14.8, does not correctly handle zero-length inputs. This allows a local attacker the ability to use the AF_ALG-based skcipher interface to cause a denial of service (uninitialized-memory free and kernel crash) or have an 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 are vulnerable.
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Description Adam Mariš 2017-12-21 09:09:56 EST
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 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 are vulnerable.

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ecaaab5649781c5a0effdaf298a925063020500e
Comment 1 Adam Mariš 2017-12-21 10:13:46 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1528337]
Comment 3 Justin M. Forbes 2018-01-29 12:55:34 EST
This was fixed for Fedora with the 4.14.8 stable updates.
Comment 8 Eric Christensen 2018-02-12 09:30:52 EST
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code with the flaw is not present in the products listed.

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, 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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