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Category:   Application (Generic)  >   curl Vendors:   curl.haxx.se
(Ubuntu Issues Fix) cURL/libcurl TLS Connection Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System
SecurityTracker Alert ID:  1036555
SecurityTracker URL:  http://securitytracker.com/id/1036555
CVE Reference:   CVE-2016-5420   (Links to External Site)
Date:  Aug 9 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:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-3048-1

Vendor URL:  www.ubuntu.com/usn/usn-3048-1 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 16.04 LTS

Message History:   This archive entry is a follow-up to the message listed below.
Aug 4 2016 cURL/libcurl TLS Connection Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System



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