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Diffstat (limited to 'doc/security.mdwn')
| -rw-r--r-- | doc/security.mdwn | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/doc/security.mdwn b/doc/security.mdwn index 4f825deba..9818e0c94 100644 --- a/doc/security.mdwn +++ b/doc/security.mdwn @@ -563,3 +563,25 @@ which are both used in most ikiwiki installations. This bug was reported on 2016-12-17. The fixed version 3.20161219 was released on 2016-12-19. ([[!cve CVE-2016-10026]]) + +## Commit metadata forgery via CGI::FormBuilder context-dependent APIs + +When CGI::FormBuilder->field("foo") is called in list context (and +in particular in the arguments to a subroutine that takes named +arguments), it can return zero or more values for foo from the CGI +request, rather than the expected single value. This breaks the usual +Perl parsing convention for named arguments, similar to CVE-2014-1572 +in Bugzilla (which was caused by a similar API design issue in CGI.pm). + +In ikiwiki, this appears to have been exploitable in two places, both +of them relatively minor: + +* in the comments plugin, an attacker who was able to post a comment + could give it a user-specified author and author-URL even if the wiki + configuration did not allow for that, by crafting multiple values + for other fields +* in the editpage plugin, an attacker who was able to edit a page + could potentially forge commit authorship (attribute their edit to + someone else) by crafting multiple values for the rcsinfo field + +(OVE-20161226-0001) |