Bug 1533890 (CVE-2018-5332) - CVE-2018-5332 kernel: rds_message_alloc_sgs() function doesn't validate value used during DMA page allocation causes heap out-of-bounds write
Summary: CVE-2018-5332 kernel: rds_message_alloc_sgs() function doesn't validate value...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-5332
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: 1533895 1533899 1538111 1538112 1538113
Blocks: 1533892
TreeView+ depends on / blocked
 
Reported: 2018-01-12 13:28 UTC by Adam Mariš
Modified: 2021-03-11 16:53 UTC (History)
44 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
In the Linux kernel through 4.14.13, the rds_message_alloc_sgs() function does not validate a value that is used during DMA page allocation, leading to a heap-based out-of-bounds write (related to the rds_rdma_extra_size() function in 'net/rds/rdma.c') and thus to a system panic. 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 03:36:48 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0470 0 normal SHIPPED_LIVE Moderate: Red Hat Enterprise MRG Realtime 2.5 security and enhancement update 2018-03-12 19:03:01 UTC

Description Adam Mariš 2018-01-12 13:28:25 UTC 
In the Linux kernel through 4.14.13, the rds_message_alloc_sgs() function does not validate a value that is used during DMA page allocation, leading to a heap-based out-of-bounds write (related to the rds_rdma_extra_size() function in 'net/rds/rdma.c') and thus to a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

References:

https://marc.info/?t=151492231500011&r=1&w=2

https://patchwork.ozlabs.org/patch/854723/

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c095508770aebf1b9218e77026e48345d719b17c
Comment 1 Adam Mariš 2018-01-12 13:38:57 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1533895]
Comment 6 Vladis Dronov 2018-01-24 13:54:08 UTC 
Statement:

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG 2. Future Linux kernel updates for the respective releases may address this issue.

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 7, its real-time kernel, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE, as a code with the flaw is not built and shipped with the products listed.
Comment 7 Vladis Dronov 2018-01-24 13:54:53 UTC 
What is Red Hat Enterprise Linux 7 for ARM 64,
        Red Hat Enterprise Linux 7 for Power 9 LE

The kernel package as shipped with Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE is an updated kernel intended to support new architectures not available at the time of Red Hat Enterprise Linux 7 original shipping. The new kernel version is based on an upstream Linux kernel version 4.11. The offering is distributed with other updated packages, but most of the userspace is the standard Red Hat Enterprise Linux 7 Server RPM files.

For more information please refer to:

https://access.redhat.com/articles/3158541
https://access.redhat.com/articles/3158511
Comment 8 errata-xmlrpc 2018-03-12 13:38:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2018:0470 https://access.redhat.com/errata/RHSA-2018:0470
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