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
Summary: CVE-2017-17805 kernel: Salsa20 encryption algorithm does not correctly handle...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-17805
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1528337 1528342 1543980 1543981 1543982 1543983 1543984 1740280 1740281 1740282
Blocks: 1528313
TreeView+ depends on / blocked
 
Reported: 2017-12-21 14:09 UTC by Adam Mariš
Modified: 2021-03-11 16:45 UTC (History)
45 users (show)

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.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:34:41 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2948 0 None None None 2018-10-30 08:56:51 UTC
Red Hat Product Errata RHSA-2018:3083 0 None None None 2018-10-30 07:31:15 UTC
Red Hat Product Errata RHSA-2018:3096 0 None None None 2018-10-30 07:37:21 UTC
Red Hat Product Errata RHSA-2019:2473 0 None None None 2019-08-13 14:59:27 UTC

Description Adam Mariš 2017-12-21 14:09:56 UTC 
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 15:13:46 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1528337]
Comment 3 Justin M. Forbes 2018-01-29 17:55:34 UTC 
This was fixed for Fedora with the 4.14.8 stable updates.
Comment 8 Eric Christensen 2018-02-12 14:30:52 UTC 
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.
Comment 9 errata-xmlrpc 2018-10-30 07:30:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3083 https://access.redhat.com/errata/RHSA-2018:3083
Comment 10 errata-xmlrpc 2018-10-30 07:37:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3096 https://access.redhat.com/errata/RHSA-2018:3096
Comment 11 errata-xmlrpc 2018-10-30 08:56:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948
Comment 13 errata-xmlrpc 2019-08-13 14:59:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2019:2473 https://access.redhat.com/errata/RHSA-2019:2473
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