Bug 1311989 (CVE-2015-7827) - CVE-2015-7827 botan: PKCS #1 decoding not in constant time
Summary: CVE-2015-7827 botan: PKCS #1 decoding not in constant time
Keywords:
Status: NEW
Alias: CVE-2015-7827
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-02-25 13:04 UTC by Andrej Nemec
Modified: 2019-09-29 13:45 UTC (History)
2 users (show)

Fixed In Version: botan 1.11.22
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:


Attachments (Terms of Use)

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.


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