Bug 2020536 (CVE-2021-43398)

Summary:	CVE-2021-43398 cryptopp: a timing leakage may lead to information disclosure
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	alekcejk, aurelien, kwizart, vascom2
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-05 09:09:24 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2020537, 2020538
Bug Blocks:

Description Marian Rehak 2021-11-05 08:37:57 UTC

A timing leakage in MakePublicKey(). There is a clear correlation between execution time and private key length, which may cause disclosure of the length information of the private key. This might allow attackers to conduct timing attacks.

Upstream Issue:

https://github.com/weidai11/cryptopp/issues/1080

Comment 1 Marian Rehak 2021-11-05 08:38:14 UTC

Created cryptopp tracking bugs for this issue:

Affects: epel-all [bug 2020538]
Affects: fedora-all [bug 2020537]

Comment 2 Product Security DevOps Team 2021-11-05 09:09:23 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.

Comment 3 Nicolas Chauvet (kwizart) 2022-01-03 14:23:01 UTC

FY Upstream as closed this as notabug
https://github.com/weidai11/cryptopp/issues/1080#issuecomment-996527355

As "key lengh value" isn't a sensible information as I understand.