Bug 1386286 (CVE-2015-8970) - CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
Summary: CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2015-8970
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: 1386234 1391589 1391590 1393299 1393300
Blocks: 1386287
TreeView+ depends on / blocked
 
Reported: 2016-10-18 14:42 UTC by Adam Mariš
Modified: 2021-02-17 03:10 UTC (History)
20 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
The lrw_crypt() function in 'crypto/lrw.c' in the Linux kernel before 4.5 allows local users to cause a system crash and a denial of service by the NULL pointer dereference via accept(2) system call for AF_ALG socket without calling setkey() first to set a cipher key.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:00:22 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1842 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 18:22:09 UTC
Red Hat Product Errata RHSA-2017:2077 0 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 18:13:37 UTC
Red Hat Product Errata RHSA-2017:2437 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2017-08-08 20:14:23 UTC
Red Hat Product Errata RHSA-2017:2444 0 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-08-08 22:50:57 UTC

Description Adam Mariš 2016-10-18 14:42:09 UTC 
The lrw_crypt() function in 'crypto/lrw.c' in the Linux kernel before 4.5 allows local users to cause a system crash and a denial of service by the NULL pointer dereference via accept(2) system call for AF_ALG socket without calling setkey() first to set a cipher key.

Bug Report:

https://groups.google.com/forum/#!msg/syzkaller/frb2XrB5aWk/xCXzkIBcDAAJ

CVE-ID request+assigning:

http://seclists.org/oss-sec/2016/q4/324

http://seclists.org/oss-sec/2016/q4/330

Related upstream patches:

dd504589577d8e8e70f51f997ad487a4cb6c026f crypto: algif_skcipher - Require setkey before accept(2)
c840ac6af3f8713a71b4d2363419145760bd6044 crypto: af_alg - Disallow bind/setkey/... after accept(2)
a383292c86663bbc31ac62cc0c04fc77504636a6 crypto: af_alg - Fix socket double-free when accept fails
37766586c965d63758ad542325a96d5384f4a8c9 crypto: af_alg - Add nokey compatibility path
a0fa2d037129a9849918a92d91b79ed6c7bd2818 crypto: algif_skcipher - Add nokey compatibility path
a5596d6332787fd383b3b5427b41f94254430827 crypto: hash - Add crypto_ahash_has_setkey
6de62f15b581f920ade22d758f4c338311c2f0d4 crypto: algif_hash - Require setkey before accept(2)
a1383cd86a062fc798899ab20f0ec2116cce39cb crypto: skcipher - Add crypto_skcipher_has_setkey
6e8d8ecf438792ecf7a3207488fb4eebc4edb040 crypto: algif_skcipher - Add key check exception for cipher_null
Comment 1 Vladis Dronov 2016-11-03 14:56:51 UTC 
Acknowledgments:

Name: Igor Redko (Virtuozzo), Vasily Averin (Virtuozzo)
Comment 5 Vladis Dronov 2016-11-04 11:17:51 UTC 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 as the code with the flaw is not present in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.
Comment 9 errata-xmlrpc 2017-08-01 19:09:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077
Comment 10 errata-xmlrpc 2017-08-02 07:48:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 11 errata-xmlrpc 2017-08-02 07:49:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 12 errata-xmlrpc 2017-08-08 16:20:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Extended Update Support

Via RHSA-2017:2437 https://access.redhat.com/errata/RHSA-2017:2437
Comment 13 errata-xmlrpc 2017-08-08 18:57:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2444 https://access.redhat.com/errata/RHSA-2017:2444
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