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Category:   Application (Generic)  >   curl Vendors:   curl.haxx.se
cURL/libcurl TLS Connection Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System
SecurityTracker Alert ID:  1036537
SecurityTracker URL:  http://securitytracker.com/id/1036537
CVE Reference:   CVE-2016-5420   (Links to External Site)
Date:  Aug 4 2016
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.1 - 7.50.0
Description:   A vulnerability was reported in cURL/libcurl. A remote user can bypass security controls on the target system.

The library may reuse a TLS connection with the incorrect client certificate. As a result, an application may send requests to the wrong target realm using the incorrect authentication method.

The command line tool is also affected.

Impact:   A remote user may be able to access data sent via a re-used TLS connection with the wrong or missing client certificate.
Solution:   The vendor has issued a fix (7.50.1).

The vendor's advisory is available at:

https://curl.haxx.se/docs/adv_20160803B.html

Vendor URL:  curl.haxx.se/docs/adv_20160803B.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 9 2016 (Ubuntu Issues Fix) cURL/libcurl TLS Connection Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, and 16.04 LTS.
Nov 4 2016 (Red Hat Issues Fix) cURL/libcurl TLS Connection Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Jan 31 2017 (IBM Issues Fix for IBM Security AppScan Source) cURL/libcurl TLS Connection Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System
IBM has issued a fix for IBM Security AppScan Source.



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