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Bug 490238 (CVE-2013-4488) - <net-libs/libgadu-1.12.0: missing ssl certificate validation (CVE-2013-4488)
Summary: <net-libs/libgadu-1.12.0: missing ssl certificate validation (CVE-2013-4488)
Alias: CVE-2013-4488
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B3 [glsa cve]
Depends on: 528240
  Show dependency tree
Reported: 2013-11-03 09:20 UTC by Agostino Sarubbo
Modified: 2015-08-15 13:00 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Agostino Sarubbo gentoo-dev 2013-11-03 09:20:42 UTC
From ${URL} :

Libgadu, an open library for communicating using the protocol e-mail, was found to have missing the 
ssl certificate validation. The issue is that libgadu uses openSSL library for creating secure 
connections. A program using openSSL can perform SSL handshake by invoking the SSL_connect 
function. Some cetrificate validation errors are signaled through, the return values of the 
SSL_connect, while for the others errors SSL_connect returns OK but sets internal "verify result" 
flags. Application must call ssl_get_verify_result function to check if any such errors occurred.  
This check seems to be missing in libgadu. And thus a man-in-the-middle attack is possible failing 
all the SSL protection.

Upstream suggested that it was a concious decision as libgadu is reverse-engineered implementation 
of a proprietary protocol, they had no control over the certificates used for SSL connections, so 
they would add a note to the documentation about this.


@maintainer(s): after the bump, in case we need to stabilize the package, please let us know if it is ready for the stabilization or not.
Comment 1 Sean Amoss (RETIRED) gentoo-dev Security 2014-12-08 23:25:17 UTC
Maintainers, please call for stabilization if 1.12.0 is ready. Thank you
Comment 2 GLSAMaker/CVETool Bot gentoo-dev 2015-01-03 15:58:25 UTC
CVE-2013-4488 (
  libgadu before 1.12.0 does not verify X.509 certificates from SSL servers,
  which allows man-in-the-middle attackers to spoof servers.
Comment 3 GLSAMaker/CVETool Bot gentoo-dev 2015-08-15 13:00:02 UTC
This issue was resolved and addressed in
 GLSA 201508-02 at
by GLSA coordinator Yury German (BlueKnight).