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Bug 1386286 - (CVE-2015-8970) CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
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=20151217,repor...
: Security
Depends On: 1393300 1386234 1391589 1391590 1393299
Blocks: 1386287
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Reported: 2016-10-18 10:42 EDT by Adam Mariš
Modified: 2018-08-28 18:08 EDT (History)
21 users (show)

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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.
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1842 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 14:22:09 EDT
Red Hat Product Errata RHSA-2017:2077 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 14:13:37 EDT
Red Hat Product Errata RHSA-2017:2437 normal SHIPPED_LIVE Important: kernel security and bug fix update 2017-08-08 16:14:23 EDT
Red Hat Product Errata RHSA-2017:2444 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-08-08 18:50:57 EDT

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Description Adam Mariš 2016-10-18 10:42:09 EDT 
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 10:56:51 EDT 
Acknowledgments:

Name: Igor Redko (Virtuozzo), Vasily Averin (Virtuozzo)
Comment 5 Vladis Dronov 2016-11-04 07:17:51 EDT 
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 15:09:43 EDT 
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 03:48:36 EDT 
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 03:49:41 EDT 
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 12:20:29 EDT 
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 14:57:39 EDT 
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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