The HTML rendering engine in Mozilla Thunderbird 1.5, when "Block loading of remote images in mail messages" is enabled, does not properly block external images from inline HTML attachments, which could allow remote attackers to obtain sensitive information, such as application version or IP address, when the user reads the email and the external image is accessed.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1975
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10254
https://exchange.xforce.ibmcloud.com/vulnerabilities/24959
http://www.vupen.com/english/advisories/2006/3749
http://www.vupen.com/english/advisories/2006/1356
http://www.securityfocus.com/bid/17516
http://www.securityfocus.com/bid/16881
http://www.securityfocus.com/archive/1/446657/100/200/threaded
http://www.redhat.com/support/errata/RHSA-2006-0330.html
http://www.novell.com/linux/security/advisories/2006_04_25.html
http://www.mozilla.org/security/announce/2006/mfsa2006-26.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:078
http://www.gentoo.org/security/en/glsa/glsa-200605-09.xml
http://www.gentoo.org/security/en/glsa/glsa-200604-18.xml
http://www.debian.org/security/2006/dsa-1051
http://www.debian.org/security/2006/dsa-1046
http://securityreason.com/securityalert/514
http://secunia.com/advisories/22065
http://secunia.com/advisories/20051
http://secunia.com/advisories/19950
http://secunia.com/advisories/19941
http://secunia.com/advisories/19902
http://secunia.com/advisories/19863