Bug 1539508 (CVE-2017-18075) - CVE-2017-18075 kernel: Mishandled freeing of instances in pcrypt.c can allow a local user to cause a denial of service
Summary: CVE-2017-18075 kernel: Mishandled freeing of instances in pcrypt.c can allow ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-18075
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: 1546457 1546458
Blocks: 1539509
TreeView+ depends on / blocked
 
Reported: 2018-01-29 04:52 UTC by Sam Fowler
Modified: 2021-02-17 00:53 UTC (History)
43 users (show)

Fixed In Version: kernel 4.14.13
Doc Type: Bug Fix
Doc Text:
crypto/pcrypt.c in the Linux kernel, before 4.14.13, mishandles freeing instances, allowing a local user able to access the AF_ALG-based AEAD interface (CONFIG_CRYPTO_USER_API_AEAD) and pcrypt (CONFIG_CRYPTO_PCRYPT) to cause a denial of service (kfree of an incorrect pointer) or possibly have unspecified other impact by executing a crafted sequence of system calls. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:38:26 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2948 0 None None None 2018-10-30 08:57:26 UTC

Description Sam Fowler 2018-01-29 04:52:19 UTC 
crypto/pcrypt.c in the Linux kernel before 4.14.13 mishandles freeing instances, allowing a local user able to access the AF_ALG-based AEAD interface (CONFIG_CRYPTO_USER_API_AEAD) and pcrypt (CONFIG_CRYPTO_PCRYPT) to cause a denial of service (kfree of an incorrect pointer) or possibly have unspecified other impact by executing a crafted sequence of system calls. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

References:

https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.13

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d76c68109f37cb85b243a1cf0f40313afd2bae68
Comment 2 Vladis Dronov 2018-02-17 18:50:33 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1546457]
Comment 6 Justin M. Forbes 2018-02-19 14:46:03 UTC 
This was fixed for Fedora with the 4.14.13 stable updates.
Comment 7 Eric Christensen 2018-02-19 15:29:32 UTC 
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, as the code with the flaw is not enabled and is not built in the products listed.

This issue affects the Linux kernel packages 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.
Comment 8 errata-xmlrpc 2018-10-30 08:57:06 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
Note You need to log in before you can comment on or make changes to this bug.