Bug 1881409 (CVE-2020-25743) - CVE-2020-25743 QEMU: ide: null pointer dereference while cancelling i/o operation
Summary: CVE-2020-25743 QEMU: ide: null pointer dereference while cancelling i/o opera...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-25743
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: 1883448 1883449 1883450 1883451 1883452 1883453 1883454 1910670
Blocks: 1850259
TreeView+ depends on / blocked
 
Reported: 2020-09-22 11:22 UTC by Prasad Pandit
Modified: 2021-12-15 12:06 UTC (History)
32 users (show)

Fixed In Version: QEMU 5.1.1
Doc Type: ---
Doc Text:
A NULL pointer dereference flaw was found in the IDE disk emulator of QEMU. This issue occurs while canceling an I/O operation via the ide_cancel_dma_sync() routine if a block drive pointer is null. This flaw allows a guest user to crash the QEMU process on the host, resulting in a denial of service.
Clone Of:
Environment:
Last Closed: 2021-12-15 12:06:54 UTC
Embargoed:

Attachments (Terms of Use)

Description Prasad Pandit 2020-09-22 11:22:29 UTC 
A null pointer dereference issue was found in the IDE disk emulator of QEMU. It could occur while cancelling an i/o operation via ide_cancel_dma_sync() routine, if a block drive pointer is null. A guest may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg01568.html
Comment 1 Prasad Pandit 2020-09-22 11:22:43 UTC 
Acknowledgments:

Name: Sergej Schumilo (Ruhr-University Bochum), Cornelius Aschermann (Ruhr-University Bochum), Simon Wrner (Ruhr-University Bochum)
Comment 2 Prasad Pandit 2020-09-22 11:22:50 UTC 
External References:

https://www.openwall.com/lists/oss-security/2020/09/29/1
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fide_nullptr1b
Comment 3 Prasad Pandit 2020-09-29 09:12:23 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1883453]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1883454]
Comment 7 Nick Tait 2021-03-02 20:14:04 UTC 
Statement:

In Red Hat OpenStack Platform, because the flaw has a lower impact and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP qemu-kvm-rhev package.
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