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AUSCERT External Security Bulletin Redistribution
ESB-2013.0535
Project cURL Security Advisory, April 12th 2013
16 April 2013
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AusCERT Security Bulletin Summary
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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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