Bug 1972885 (CVE-2021-34550)

Summary:	CVE-2021-34550 tor: out-of-bounds memory access in v3 onion service descriptor parsing
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	casper, lewk, mh, paul.wouters, rh-bugzilla, s
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2021-06-16 21:05:01 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Bug Depends On:	1972886, 1972887
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Description Guilherme de Almeida Suckevicz 2021-06-16 19:44:37 UTC

Fix an out-of-bounds memory access in v3 onion service descriptor parsing. An attacker could exploit this bug by crafting an onion service descriptor that would crash any client that tried to visit it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei Glazunov from Google's Project Zero.

References:
https://lists.torproject.org/pipermail/tor-announce/2021-June/000220.html
https://lists.torproject.org/pipermail/tor-announce/2021-June/000221.html

Comment 1 Guilherme de Almeida Suckevicz 2021-06-16 19:45:59 UTC

Created tor tracking bugs for this issue:

Affects: epel-all [bug 1972887]
Affects: fedora-all [bug 1972886]

Comment 2 Product Security DevOps Team 2021-06-16 21:05:01 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.