The archive management (arc_manage) page in wwsympa/wwsympa.fcgi.in in Sympa before 6.1.11 does not check permissions, which allows remote attackers to list, read, and delete arbitrary list archives via vectors related to the (1) do_arc_manage, (2) do_arc_download, or (3) do_arc_delete functions.
https://www.sympa.org/distribution/latest-stable/NEWS
http://www.securityfocus.com/bid/53503
http://www.openwall.com/lists/oss-security/2012/05/12/8
http://www.openwall.com/lists/oss-security/2012/05/12/2
http://www.openwall.com/lists/oss-security/2012/05/11/8
http://www.debian.org/security/2012/dsa-2477