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Bug 1154908 - (CVE-2014-3694) CVE-2014-3694 pidgin: SSL/TLS plug-ins failed to check Basic Constraints
CVE-2014-3694 pidgin: SSL/TLS plug-ins failed to check Basic Constraints
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
: ---
: ---
Assigned To: Red Hat Product Security
impact=low,public=20141022,reported=2...
: Reopened, Security
Depends On: 1155838 1340770 1403136 1446519
Blocks: 1154913 1415638
  Show dependency tree / graph
 
Reported: 2014-10-20 23:16 EDT by Murray McAllister
Modified: 2018-07-31 17:42 EDT (History)
11 users (show)

See Also:
Fixed In Version: pidgin 2.10.10
Doc Type: Bug Fix
Doc Text:
It was found that Pidgin's SSL/TLS plug-ins had a flaw in the certificate validation functionality. An attacker could use this flaw to create a fake certificate, that Pidgin would trust, which could be used to conduct man-in-the-middle attacks against Pidgin.
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Clone Of:
Environment:
Last Closed: 2014-12-16 14:30:14 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
patch from upstream (17.37 KB, patch)
2014-10-20 23:17 EDT, Murray McAllister 		no flags Details | Diff
Add an attachment (proposed patch, testcase, etc.)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1854 normal SHIPPED_LIVE Moderate: pidgin security, bug fix, and enhancement update 2017-08-01 14:23:14 EDT

  None (edit)
Description Murray McAllister 2014-10-20 23:16:13 EDT 
It was reported that the SSL/TLS plug-ins failed to check that the Basic Constraints extension allowed intermediate certificates to act as Certificate Authorities (CAs). An attacker could use this flaw to create a fake certificate that Pidgin would trust, which could be used for man-in-the-middle attacks.

This is the same situation as described in http://www.thoughtcrime.org/ie-ssl-chain.txt

Acknowledgments:

Name: the Pidgin project
Upstream: Jacob Appelbaum, Moxie Marlinspike
Comment 1 Murray McAllister 2014-10-20 23:17:13 EDT 
Created attachment 948786 [details]
patch from upstream
Comment 3 Murray McAllister 2014-10-22 21:21:43 EDT 
Public now:

http://www.pidgin.im/news/security/?id=86
Comment 4 Murray McAllister 2014-10-22 21:26:43 EDT 
Created pidgin tracking bugs for this issue:

Affects: fedora-all [bug 1155838]
Comment 5 Fedora Update System 2014-11-10 01:31:35 EST 
pidgin-2.10.10-2.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2014-11-10 01:47:35 EST 
pidgin-2.10.10-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Siddharth Sharma 2014-12-02 04:58:13 EST 
Analysis
========

Basic Constraints checking is missing for the certificates in the code for pidgin, so attacker who already has an valid CA-Signed Certificate of any domain can generate a valid CA-Signed certificate and request signature for any other domain. As there are no checks for Basic Constraints it fails to the check if there is an man-in-the-middle attack executed with the help of malicious certificate whenever there is SSL connection intiated with the server.
Comment 13 errata-xmlrpc 2017-08-01 16:20:38 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1854 https://access.redhat.com/errata/RHSA-2017:1854
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