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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0535
              Project cURL Security Advisory, April 12th 2013
                               16 April 2013

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libcurl
Publisher:         Project cURL
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-1944  

Original Bulletin: 
   http://curl.haxx.se/docs/adv_20130412.html

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                       libcurl cookie domain tailmatch
                       ===============================
 
Project cURL Security Advisory, April 12th 2013
http://curl.haxx.se/docs/security.html
 
1. VULNERABILITY
 
  libcurl is vulnerable to a cookie leak vulnerability when doing requests
  across domains with matching tails.
 
  When communicating over HTTP(S) and having libcurl's cookie engine enabled,
  libcurl will store and hold cookies for use when subsequent requests are
  done to hosts and paths that match those kept cookies. Due to a bug in the
  tailmatching function, libcurl could wrongly send cookies meant for the
  domain 'ample.com' when communicating with 'example.com'.
 
  This vulnerability can be used to hijack sessions in targetted attacks since
  registering domains using a known domain's name as an ending is trivial.
 
  Both curl the command line tool and applications using the libcurl library
  are vulnerable.
 
  There are no known exploits available at this time.
 
  The Common Vulnerabilities and Exposures (CVE) project has assigned the name
  CVE-2013-1944 to this issue.
 
2. AFFECTED VERSIONS
 
  Affected versions: all versions to and including 7.29.0
  Not affected versions: curl >= 7.30.0
 
  libcurl is used by many applications, but not always advertised as such!
 
3. THE SOLUTION
 
  libcurl 7.30.0 implements the function properly and will not send cookies to
  sites just because the host names use the same tail.
 
4. RECOMMENDATIONS
 
  We suggest you take one of the following actions immediately, in order of
  preference:
 
  A - Upgrade to curl and libcurl 7.30.0
 
  B - Apply this patch and rebuild libcurl
 
      http://curl.haxx.se/curl-tailmatch.patch
 
  C - Disable use of cookies or HTTP entirely in your application
 
5. TIME LINE
 
  Vulnerability found and patched by YAMADA Yasuharu.
 
  It was reported (publicly) to the curl project on April 9th 2013.
 
  curl 7.30.0 was released on April 12th 2013, coordinated with the
  publication of this advisory.
 
6. CREDITS
 
  Reported and fixed by YAMADA Yasuharu. Thanks a lot!

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