Bug 1843771 (CVE-2020-13800) - CVE-2020-13800 QEMU: ati-vga: infinite recursion in ati_mm_read/write calls may lead to DoS
Summary: CVE-2020-13800 QEMU: ati-vga: infinite recursion in ati_mm_read/write calls m...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-13800
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1843772 1910689
Blocks: 1772801
TreeView+ depends on / blocked
 
Reported: 2020-06-04 05:45 UTC by Prasad Pandit
Modified: 2022-04-17 20:57 UTC (History)
29 users (show)

Fixed In Version: QEMU 5.0.1
Doc Type: If docs needed, set a value
Doc Text:
An infinite recursion flaw was found in the ati-vga emulator of the QEMU. The issue occurs in ati_mm_read/write routines while accessing VGA registers, for certain values of the 'mm_index' variable. This flaw allows a guest user or process to crash the QEMU process, resulting in a denial of service.
Clone Of:
Environment:
Last Closed: 2020-06-04 11:20:31 UTC
Embargoed:

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Description Prasad Pandit 2020-06-04 05:45:28 UTC 
An infinite recursion issue was found in the ati-vga emulator of the QEMU. It could occur in ati_mm_read/write routines while accessing VGA registers, for certain values of the 'mm_index' variable. A guest user/process may use this flaw to crash the QEMU process resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg00944.html
Comment 1 Prasad Pandit 2020-06-04 05:45:35 UTC 
Acknowledgments:

Name: Ren Ding (SSLab Georgia Tech), Hanqing Zhao (SSLab Georgia Tech), Yi Ren
Comment 2 Prasad Pandit 2020-06-04 05:46:01 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1843772]
Comment 4 Prasad Pandit 2020-06-04 06:29:35 UTC 
External References:

https://www.openwall.com/lists/oss-security/2020/06/04/2
Comment 5 Product Security DevOps Team 2020-06-04 11:20:31 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-2020-13800
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