Bug 1784130 (CVE-2019-19319) - CVE-2019-19319 kernel: out-of-bounds write in ext4_xattr_set_entry in fs/ext4/xattr.c
Summary: CVE-2019-19319 kernel: out-of-bounds write in ext4_xattr_set_entry in fs/ext4...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-19319
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: 1784131 1836664 1836665 1836666 1836667 1836668
Blocks: 1784135
TreeView+ depends on / blocked
 
Reported: 2019-12-16 18:50 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 20:51 UTC (History)
45 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2020-11-04 02:23:47 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:4431 0 None None None 2020-11-04 00:50:17 UTC
Red Hat Product Errata RHSA-2020:4609 0 None None None 2020-11-04 02:22:18 UTC

Description Guilherme de Almeida Suckevicz 2019-12-16 18:50:52 UTC 
In the Linux kernel 5.0.21, a setxattr operation, after a mount of a crafted ext4 image, can cause a slab-out-of-bounds write access because of an ext4_xattr_set_entry use-after-free in fs/ext4/xattr.c when a large old_size value is used in a memset call.

Reference:
https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19319
Comment 1 Guilherme de Almeida Suckevicz 2019-12-16 18:51:52 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1784131]
Comment 4 Justin M. Forbes 2020-05-13 22:22:00 UTC 
That was fixed for Fedora with the 5.2 kernel rebases.
Comment 6 Alex 2020-05-17 17:00:10 UTC 
Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Comment 10 Petr Matousek 2020-05-26 12:51:04 UTC 
Statement:

This issue is rated as having Moderate impact because of the preconditions needed to trigger the issue (physical access or user interaction to mount the crafted filesystem image).
Comment 11 errata-xmlrpc 2020-11-04 00:50:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4431 https://access.redhat.com/errata/RHSA-2020:4431
Comment 12 errata-xmlrpc 2020-11-04 02:22:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4609 https://access.redhat.com/errata/RHSA-2020:4609
Comment 13 Product Security DevOps Team 2020-11-04 02:23:47 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-19319
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