Google Chrome before 29 sends HTTP Cookie headers without first validating that they have the required character-set restrictions, which allows remote attackers to conduct the equivalent of a persistent Logout CSRF attack via a crafted parameter that forces a web application to set a malformed cookie within an HTTP response.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-6166
• https://code.google.com/p/chromium/issues/detail?id=238041
• http://redmine.lighttpd.net/issues/2188
• http://seclists.org/oss-sec/2013/q4/117
• http://seclists.org/oss-sec/2013/q4/121
• http://www.openwall.com/lists/oss-security/2013/04/03/10