Bug 1311989 (CVE-2015-7827)

Summary:	CVE-2015-7827 botan: PKCS #1 decoding not in constant time
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	carnil, thomas.moschny
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	botan 1.11.22	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-21 00:50:37 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:

Description Andrej Nemec 2016-02-25 13:04:38 UTC

During RSA decryption, length of decoding of PKCS #1 v1.5 padding took was input dependent. If these differences could be measured by an attacker, it could be used to mount a Bleichenbacher million-message attack. PKCS #1 v1.5 decoding has been rewritten to use a sequence of operations which do not contain any input-dependent indexes or jumps. Notations for checking constant time blocks with ctgrind (https://github.com/agl/ctgrind) were added to PKCS #1 decoding among other areas.

External references:

http://botan.randombit.net/security.html

Comment 1 Fedora Update System 2016-05-07 11:44:00 UTC

botan-1.10.13-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 2 Fedora Update System 2016-05-15 05:31:53 UTC

botan-1.10.13-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-05-16 14:54:48 UTC

botan-1.10.13-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-05-20 20:19:42 UTC

botan-1.10.13-1.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.