Bug 1995253 (CVE-2021-38385)

Summary:	CVE-2021-38385 tor: assertion failure in signature verification
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:	lewk, mh, msaulnier, pablo, 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:	2021-08-18 21:35:21 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1995254, 1995255
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Description Guilherme de Almeida Suckevicz 2021-08-18 16:59:09 UTC

Resolve an assertion failure caused by a behavior mismatch between our batch-signature verification code and our single-signature verification code. This assertion failure could be triggered remotely, leading to a denial of service attack. We fix this issue by disabling batch verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is also tracked as TROVE-2021-007 and CVE-2021-38385.

Reference:
https://lists.torproject.org/pipermail/tor-packagers/2021-August/000128.html

Comment 1 Guilherme de Almeida Suckevicz 2021-08-18 16:59:27 UTC

Created tor tracking bugs for this issue:

Affects: epel-all [bug 1995255]
Affects: fedora-all [bug 1995254]

Comment 2 Product Security DevOps Team 2021-08-18 21:35:21 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.