CVE-2012-2128

Cross-site request forgery (CSRF) vulnerability in doku.php in DokuWiki 2012-01-25 Angua allows remote attackers to hijack the authentication of administrators for requests that add arbitrary users. NOTE: this issue has been disputed by the vendor, who states that it is resultant from CVE-2012-2129: the exploit code simply uses the XSS hole to extract a valid CSRF token.

Weakness

The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

Affected Software

Potential Mitigations

• Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• For example, use anti-CSRF packages such as the OWASP CSRFGuard. [REF-330]
• Another example is the ESAPI Session Management control, which includes a component for CSRF. [REF-45]
• Use the “double-submitted cookie” method as described by Felten and Zeller:
• When a user visits a site, the site should generate a pseudorandom value and set it as a cookie on the user’s machine. The site should require every form submission to include this value as a form value and also as a cookie value. When a POST request is sent to the site, the request should only be considered valid if the form value and the cookie value are the same.
• Because of the same-origin policy, an attacker cannot read or modify the value stored in the cookie. To successfully submit a form on behalf of the user, the attacker would have to correctly guess the pseudorandom value. If the pseudorandom value is cryptographically strong, this will be prohibitively difficult.
• This technique requires Javascript, so it may not work for browsers that have Javascript disabled. [REF-331]

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/111.html
• https://cwe.mitre.org/data/definitions/462.html
• https://cwe.mitre.org/data/definitions/467.html
• https://cwe.mitre.org/data/definitions/62.html

References

• http://bugs.dokuwiki.org/index.php?do=details\u0026task_id=2488
• http://ircrash.com/uploads/dokuwiki.txt
• http://seclists.org/bugtraq/2012/Apr/121
• http://secunia.com/advisories/48848
• http://www.openwall.com/lists/oss-security/2012/04/22/4
• http://www.openwall.com/lists/oss-security/2012/04/23/1
• http://www.securityfocus.com/bid/53041
• https://bugzilla.redhat.com/show_bug.cgi?id=815122
• https://exchange.xforce.ibmcloud.com/vulnerabilities/74907