Squirrelmail 1.4.15 does not set the secure flag for the session cookie in an https session, which can cause the cookie to be sent in http requests and make it easier for remote attackers to capture this cookie.
int21.de/cve/CVE-2008-3663-squirrelmail.html
lists.apple.com/archives/security-announce/2009/Feb/msg00000.html
lists.opensuse.org/opensuse-security-announce/2008-12/msg00003.html
lists.opensuse.org/opensuse-security-announce/2009-02/msg00002.html
secunia.com/advisories/33937
securityreason.com/securityalert/4304
support.apple.com/kb/HT3438
www.nabble.com/ANNOUNCE:-SquirrelMail-1.4.16-Released-td19711998.html
www.securityfocus.com/archive/1/496601/100/0/threaded
www.securityfocus.com/bid/31321
exchange.xforce.ibmcloud.com/vulnerabilities/45700
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10548