Bug 1228600 (CVE-2015-1788)

Summary: CVE-2015-1788 OpenSSL: Malformed ECParameters causes infinite loop
Product: [Other] Security Response Reporter: Huzaifa S. Sidhpurwala <huzaifas>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: cdewolf, csutherl, dandread, darran.lofthouse, dknox, jason.greene, jawilson, jclere, jdoyle, lgao, mbabacek, myarboro, pgier, psampaio, pslavice, rsvoboda, security-response-team, tmraz, twalsh, vtunka, weli, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
It was reported that OpenSSL could enter an infinite loop when processing an ECParameters structure if the curve specified is over a specially malformed binary polynomial field. This can be used to perform denial of service attacks against any system which processes public keys, certificate requests or certificates, including TLS clients and TLS servers with client authentication enabled.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2015-06-09 06:20:24 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: 1228620, 1228621    
Bug Blocks: 1227577    
Attachments:
Description Flags
Proposed patch for CVE-2015-1788 none

Description Huzaifa S. Sidhpurwala 2015-06-05 10:08:57 UTC 
The following was reported by OpenSSL upstream:

When processing an ECParameters structure OpenSSL enters an infinite loop if
the curve specified is over a specially malformed binary polynomial field.

This can be used to perform denial of service against any
system which processes public keys, certificate requests or
certificates.  This includes TLS clients and TLS servers with
client authentication enabled.

This issue affects OpenSSL versions: 1.0.2 and 1.0.1. Recent
1.0.0 and 0.9.8 versions are not affected. 1.0.0d and 0.9.8r and below are
affected.

OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
OpenSSL 1.0.0d (and below) users should upgrade to 1.0.0s
OpenSSL 0.9.8r (and below) users should upgrade to 0.9.8zg

This issue was reported to OpenSSL on 6th April 2015 by Joseph Birr-Pixton. The
fix was developed by Andy Polyakov of the OpenSSL development team.

Acknowledgements:

Red Hat would like to thank the OpenSSL project for reporting this issue.
Comment 1 Huzaifa S. Sidhpurwala 2015-06-05 10:27:47 UTC 
Created attachment 1035150 [details]
Proposed patch for CVE-2015-1788
Comment 2 Tomas Mraz 2015-06-08 15:07:15 UTC 
Note that this issue does not affect RHEL and Fedora as we remove the ECC support for the binary curves (GF(2m)).
Comment 4 Huzaifa S. Sidhpurwala 2015-06-09 06:16:14 UTC 
Statement:

Not vulnerable. This issue does not affect the versions of openssl package as shipped with Red Hat Enterprise Linux 5, 6 and 7.
Comment 5 Huzaifa S. Sidhpurwala 2015-06-09 06:20:24 UTC 
This issue does not affect the versions of openssl package as shipped with Fedora 21 and 22.
Comment 7 Huzaifa S. Sidhpurwala 2015-06-12 04:20:27 UTC 
Public via:

https://www.openssl.org/news/secadv_20150611.txt

Upstream commits:

OpenSSL-1.0.1:
https://github.com/openssl/openssl/commit/f61bbf8da532038ed0eae16a9a11771f3da22d30
Comment 8 Tomas Hoger 2015-06-15 12:33:00 UTC 
A blog post about this issue form the original reporter, which also provides a reproducer:

https://jbp.io/2015/06/11/cve-2015-1788-openssl-binpoly-hang/