Bug 1176810 – VUL-1: CVE-2020-25741: kvm,qemu: fdc: null pointer dereference during r/w data transfer

Bug 1176810 - (CVE-2020-25741) VUL-1: CVE-2020-25741: kvm,qemu: fdc: null pointer dereference during r/w data transfer

(CVE-2020-25741)
Summary:	VUL-1: CVE-2020-25741: kvm,qemu: fdc: null pointer dereference during r/w dat...

Status:	NEW

Classification:	Novell Products
Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents
Version:	unspecified
Hardware:	Other Other

Priority:	P4 - Low Severity: Normal
Target Milestone:	---
Assigned To:	Dario Faggioli
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/268006/
Whiteboard:	CVSSv3.1:SUSE:CVE-2020-25741:4.4:(AV:...
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Reported:	2020-09-22 13:08 UTC by Wolfgang Frisch
Modified:	2021-11-30 12:55 UTC (History)
CC List:	4 users (show)

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Found By:	Security Response Team
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Description Wolfgang Frisch 2020-09-22 13:08:20 UTC

CVE-2020-25741:

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.

References:
https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg07779.html
https://bugzilla.redhat.com/show_bug.cgi?id=1881401
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25741

Comment 1 Wolfgang Frisch 2020-09-22 13:14:41 UTC

Affects all supported code streams.
The code in qemu-1.4.2 and older is slightly different, but also lacks the null pointer check.