Bug 1881401 (CVE-2020-25741) - CVE-2020-25741 QEMU: fdc: null pointer dereference during r/w data transfer
Summary: CVE-2020-25741 QEMU: fdc: null pointer dereference during r/w data transfer
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-25741
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: 1881402 1881403 1881404 1881405 1881406 1881407 1881408 1910673
Blocks: 1850259
TreeView+ depends on / blocked
 
Reported: 2020-09-22 11:04 UTC by Prasad Pandit
Modified: 2021-12-15 12:06 UTC (History)
33 users (show)

Fixed In Version: QEMU 5.1.1
Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference flaw was found in the Floppy disk emulator of QEMU. This issue occurs while transferring data via the fdctrl_read_data() and fdctrl_write_data() routines if the current drive has a null block pointer. 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 12:06:28 UTC
Embargoed:

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Description Prasad Pandit 2020-09-22 11:04:22 UTC 
A null pointer dereference issue was found in the Floppy disk emulator of QEMU. It could occur while transferring data via fdctrl_read_data(), fdctrl_write_data() routines, if current drive has a null block pointer. 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/msg07779.html
Comment 1 Prasad Pandit 2020-09-22 11:04:37 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 11:04:45 UTC 
External References:

https://www.openwall.com/lists/oss-security/2020/09/29/1
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Ffdc_nullptr1
Comment 3 Prasad Pandit 2020-09-22 11:05:34 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1881402]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1881403]
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