Bug 2256542 (CVE-2024-21886, ZDI-CAN-22840) - CVE-2024-21886 xorg-x11-server: heap buffer overflow in DisableDevice
Summary: CVE-2024-21886 xorg-x11-server: heap buffer overflow in DisableDevice
Keywords:
Status: NEW
Alias: CVE-2024-21886, ZDI-CAN-22840
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2258934 2258935
Blocks: 2256538
TreeView+ depends on / blocked
 
Reported: 2024-01-02 22:14 UTC by Robb Gatica
Modified: 2024-03-26 13:23 UTC (History)
1 user (show)

Fixed In Version: xorg-server-21.1.11, xwayland-23.2.4
Doc Type: If docs needed, set a value
Doc Text:
A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding environments.
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2024:0320 0 None None None 2024-01-22 13:43:30 UTC
Red Hat Product Errata RHSA-2024:0557 0 None None None 2024-01-30 10:56:23 UTC
Red Hat Product Errata RHSA-2024:0558 0 None None None 2024-01-30 10:59:57 UTC
Red Hat Product Errata RHSA-2024:0597 0 None None None 2024-01-30 14:09:59 UTC
Red Hat Product Errata RHSA-2024:0607 0 None None None 2024-01-30 14:53:42 UTC
Red Hat Product Errata RHSA-2024:0614 0 None None None 2024-01-30 15:21:22 UTC
Red Hat Product Errata RHSA-2024:0617 0 None None None 2024-01-31 07:07:35 UTC
Red Hat Product Errata RHSA-2024:0621 0 None None None 2024-01-30 16:07:39 UTC
Red Hat Product Errata RHSA-2024:0626 0 None None None 2024-01-31 08:31:18 UTC
Red Hat Product Errata RHSA-2024:0629 0 None None None 2024-01-31 08:43:42 UTC

Description Robb Gatica 2024-01-02 22:14:55 UTC 
ZDI-CAN-22840 - VULNERABILITY DETAILS
* Version tested:1.21.1.7
* Installer file:-
* Platform tested:debian-live-12.2.0-amd64-xfce.iso

### Analysis

The exploit doesn't work if the OS installed on vmware and default virtualbox it works on virtualbox with VBoxVGA graphic controller

DisableDevice() function is called whenever an enabled device is disabled. However, its link/unlink operation has issue during the recursive call to
DisableDevice(). It leads to the length mismatch between the total number of device and the number of device in the list. Then, it leads to heap overflow and LPE for some distribution (xorg in debian xfce is run as root under specific display driver) and RCE for sshx11 forwarding environment.

Reference: https://gitlab.freedesktop.org/xorg/xserver/-/blob/8cce7f5d64d4f1027801892631b65b2c859cc559/dix/devices.c#L449
Comment 7 Sandipan Roy 2024-01-18 04:25:39 UTC 
Created tigervnc tracking bugs for this issue:

Affects: fedora-all [bug 2258935]


Created xorg-x11-server tracking bugs for this issue:

Affects: fedora-all [bug 2258934]
Comment 8 errata-xmlrpc 2024-01-22 13:43:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2024:0320 https://access.redhat.com/errata/RHSA-2024:0320
Comment 9 errata-xmlrpc 2024-01-30 10:56:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:0557 https://access.redhat.com/errata/RHSA-2024:0557
Comment 10 errata-xmlrpc 2024-01-30 10:59:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.4 Telecommunications Update Service

Via RHSA-2024:0558 https://access.redhat.com/errata/RHSA-2024:0558
Comment 11 errata-xmlrpc 2024-01-30 14:09:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:0597 https://access.redhat.com/errata/RHSA-2024:0597
Comment 12 errata-xmlrpc 2024-01-30 14:53:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:0607 https://access.redhat.com/errata/RHSA-2024:0607
Comment 13 errata-xmlrpc 2024-01-30 15:21:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Extended Update Support

Via RHSA-2024:0614 https://access.redhat.com/errata/RHSA-2024:0614
Comment 14 errata-xmlrpc 2024-01-30 16:07:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0621 https://access.redhat.com/errata/RHSA-2024:0621
Comment 15 errata-xmlrpc 2024-01-31 07:07:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support
  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2024:0617 https://access.redhat.com/errata/RHSA-2024:0617
Comment 16 errata-xmlrpc 2024-01-31 08:31:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:0626 https://access.redhat.com/errata/RHSA-2024:0626
Comment 17 errata-xmlrpc 2024-01-31 08:43:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2024:0629 https://access.redhat.com/errata/RHSA-2024:0629
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