[v2.3] Vulnerability in curl < 7.30.0 allows session hijack
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1944
http://curl.haxx.se/docs/adv\_20130412.html
- 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.
- 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!
- 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.
- 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
- 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.
- CREDITS
Reported and fixed by YAMADA Yasuharu. Thanks a lot!
(from redmine: issue id 1813, created on 2013-04-24, closed on 2013-04-24)
- Relations:
- duplicates #1780 (closed)