-Let's do an ikiwiki security analysis.
-
If you are using ikiwiki to render pages that only you can edit, do not
generate any wrappers, and do not use the cgi, then there are no more
security issues with this program than with cat(1). If, however, you let
others edit pages in your wiki, then some possible security issues do need
to be kept in mind.
+If you find a new security vulnerability, please email the maintainers
+privately instead of listing it in a public bug tracker, so that we can
+arrange for coordinated disclosure when a fix is available. The maintainers
+are [[Joey Hess|joey]] (<joey@kitenet.net>),
+[[Simon McVittie|smcv]] (<smcv@debian.org>)
+and [[Amitai Schleier|schmonz]] (<schmonz-web-ikiwiki@schmonz.com>).
+
[[!toc levels=2]]
----
allowing an attacker to carry out cross-site scripting by directing a
user to a URL that would result in a crafted ikiwiki error message. This
was discovered on 4 May by the ikiwiki developers, and the fixed version
-3.20160506 was released on 6 May. An upgrade is recommended for sites using
+3.20160506 was released on 6 May. The same fixes were backported to Debian
+8 "jessie" in version 3.20141016.3. A backport to Debian 7 "wheezy" is
+in progress.
+
+An upgrade is recommended for sites using
the CGI. ([[!cve CVE-2016-4561]], OVE-20160505-0012)
## ImageMagick CVE-2016–3714 ("ImageTragick")
-ikiwiki 3.20160506 attempts to mitigate [[!cve CVE-2016-3714]] and any
+ikiwiki 3.20160506 and 3.20141016.3 attempt to mitigate
+[[!cve CVE-2016-3714]], and any
future ImageMagick vulnerabilities that resemble it, by restricting the
image formats that the [[ikiwiki/directive/img]] directive is willing to
resize. An upgrade is recommended for sites where an untrusted user is
able to attach images. Upgrading ImageMagick to a version where
CVE-2016-3714 has been fixed is also recommended, but at the time of
writing no such version is available.
+
+## Perl CVE-2016-1238 (current working directory in search path)
+
+ikiwiki 3.20160728 attempts to mitigate [[!cve CVE-2016-1238]] by
+removing `'.'` from the Perl library search path. An attacker with write
+access to ikiwiki's current working directory could potentially use this
+vulnerability to execute arbitrary Perl code. An upgrade is recommended
+for sites where an untrusted user is able to attach files with arbitrary
+names and/or run a setuid ikiwiki wrapper with a working directory of
+their choice.
+
+## <span id="cve-2016-9645">Editing restriction bypass for git revert</span>
+
+intrigeri discovered that a web or git user could revert a change to a
+page they are not allowed to edit, if the change being reverted was made
+before the page was moved from a location where that user had permission
+to edit it. For example, if a file is moved from `drafts/policy.mdwn`
+(editable by less-trusted users) to `policy.mdwn` (only editable
+by more-trusted users), a less-trusted user could revert a change
+that was made to `drafts/policy.mdwn` prior to that move, and it would
+result in `policy.mdwn` being altered.
+
+This affects sites with the `git` VCS and the `recentchanges` plugin,
+which are both used in most ikiwiki installations.
+
+This bug was reported on 2016-12-17. A partially fixed version
+3.20161219 was released on 2016-12-19, but the solution used in that
+version was not effective with git versions older than 2.8.0.
+A more complete fix was released on 2016-12-29 in version 3.20161229.
+A backport to Debian 8 'jessie' is in progress.
+
+([[!cve CVE-2016-10026]] represents the original vulnerability.
+[[!cve CVE-2016-9645]]/OVE-20161226-0002 represents the vulnerability
+in 3.20161219 caused by the incomplete fix.)
+
+## <span id="cve-2016-9646">Commit metadata forgery via CGI::FormBuilder context-dependent APIs</span>
+
+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
+
+This was fixed in ikiwiki 3.20161229. A backport to Debian 8
+'jessie' is in progress.
+
+([[!cve CVE-2016-9646]]/OVE-20161226-0001)