Bug 1203788 – VUL-0: CVE-2022-3165: qemu,kvm: integer underflow in vnc_client_cut_text_ext() leads to CPU exhaustion

Bug 1203788 - (CVE-2022-3165) VUL-0: CVE-2022-3165: qemu,kvm: integer underflow in vnc_client_cut_text_ext() leads to CPU exhaustion

(CVE-2022-3165)
Summary:	VUL-0: CVE-2022-3165: qemu,kvm: integer underflow in vnc_client_cut_text_ext(...

Status:	NEW

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

Priority:	P3 - Medium Severity: Normal
Target Milestone:	---
Assigned To:	E-mail List
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/343578/
Whiteboard:	CVSSv3.1:SUSE:CVE-2022-3165:6.5:(AV:N...
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Reported:	2022-09-27 11:12 UTC by Carlos López
Modified:	2023-02-01 14:09 UTC (History)
CC List:	4 users (show)

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Found By:	Security Response Team
Services Priority:
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Blocker:	---
Marketing QA Status:	---
IT Deployment:	---

Flags:	thomas.leroy: needinfo? (kvm-bugs)

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Description Carlos López 2022-09-27 11:12:54 UTC

rh#2129739

An integer underflow issue was found in the QEMU VNC server while processing ClientCutText messages in the extended format [1]. A malicious client could use this flaw to make QEMU unresponsive by sending a specially crafted payload message, resulting in a denial of service condition.

[1] https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#extended-clipboard-pseudo-encoding

References:
https://bugzilla.redhat.com/show_bug.cgi?id=2129739
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-3165

Comment 1 Carlos López 2022-09-27 11:16:47 UTC

Clipboard support was added in 0bf41cab93e5c72dcda7 ("ui/vnc: clipboard support"), which is only present in SUSE:SLE-15-SP4:Update and Factory, so only those are affected.

Proposed patch (not merged yet):
https://lists.nongnu.org/archive/html/qemu-devel/2022-09/msg03948.html

Comment 3 Carlos López 2022-10-19 12:51:46 UTC

Merged:
https://gitlab.com/qemu-project/qemu/-/commit/d307040b18bfcb1393b910f1bae753d5c12a4dc7

Comment 4 Thomas Leroy 2022-12-27 13:30:57 UTC

Any update please? :)