update re template change

[ikiwiki.git] / doc / security.mdwn

diff --git a/doc/security.mdwn b/doc/security.mdwn
index 57cac719f41c7bd0bba1f46e472f8a0e486327d8..34a0052397fa857552051fc7e06cef84a1ccab01 100644 (file)
--- a/doc/security.mdwn
+++ b/doc/security.mdwn
@@ -6,7 +6,7 @@ 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.
 
-[[toc levels=2]]
+[[!toc levels=2]]
 
 ----
 
@@ -41,11 +41,12 @@ who's viewing the wiki, that can be a security problem.
 
 Of course nobody else seems to worry about this in other wikis, so should we?
 
-Currently only people with direct commit access can upload such files
+People with direct commit access can upload such files
 (and if you wanted to you could block that with a pre-commit hook).
-Users with only web commit access are limited to editing pages as ikiwiki
-doesn't support file uploads from browsers (yet), so they can't exploit
-this.
+
+The attachments plugin is not enabled by default. If you choose to
+enable it, you should make use of its powerful abilities to filter allowed
+types of attachments, and only let trusted users upload.
 
 It is possible to embed an image in a page edited over the web, by using
 `img src="data:image/png;"`. Ikiwiki's htmlscrubber only allows `data:`
@@ -65,8 +66,7 @@ So it's best if only one person can ever directly write to those directories.
 ## setup files
 
 Setup files are not safe to keep in the same revision control repository
-with the rest of the wiki. Just don't do it. [[ikiwiki.setup]] is *not*
-used as the setup file for this wiki, BTW.
+with the rest of the wiki. Just don't do it.
 
 ## page locking can be bypassed via direct commits
 
@@ -162,10 +162,11 @@ closed though.
 
 ## HTML::Template security
 
-If the [[plugins/template]] plugin is enabled, users can modify templates
-like any other part of the wiki. This assumes that HTML::Template is secure
+If the [[plugins/template]] plugin is enabled, all users can modify templates
+like any other part of the wiki. Some trusted users can modify templates
+without it too. This assumes that HTML::Template is secure
 when used with untrusted/malicious templates. (Note that includes are not
-allowed, so that's not a problem.)
+allowed.)
 
 ----
 
@@ -361,9 +362,9 @@ allow the security hole to be exploited.
 
 The htmlscrubber did not block javascript in uris. This was fixed by adding
 a whitelist of valid uri types, which does not include javascript. 
-([[cve CVE-2008-0809]]) Some urls specifyable by the meta plugin could also
+([[!cve CVE-2008-0809]]) Some urls specifyable by the meta plugin could also
 theoretically have been used to inject javascript; this was also blocked
-([[cve CVE-2008-0808]]).
+([[!cve CVE-2008-0808]]).
 
 This hole was discovered on 10 February 2008 and fixed the same day
 with the release of ikiwiki 2.31.1. (And a few subsequent versions..)
@@ -376,7 +377,7 @@ parties.
 Cross Site Request Forging could be used to constuct a link that would
 change a logged-in user's password or other preferences if they clicked on
 the link. It could also be used to construct a link that would cause a wiki
-page to be modified by a logged-in user. ([[cve CVE-2008-0165]])
+page to be modified by a logged-in user. ([[!cve CVE-2008-0165]])
 
 These holes were discovered on 10 April 2008 and fixed the same day with
 the release of ikiwiki 2.42. A fix was also backported to Debian etch, as
@@ -390,7 +391,7 @@ pre-emtively guard against that, current versions of ikiwiki store password
 hashes (using Eksblowfish).
 
 If you use the [[plugins/passwordauth]] plugin, I recommend upgrading to
-ikiwiki 2.48, installing the [[cpan Authen::Passphrase]] perl module, and running
+ikiwiki 2.48, installing the [[!cpan Authen::Passphrase]] perl module, and running
 `ikiwiki-transition hashpassword` to replace all existing cleartext passwords
 with strong blowfish hashes. 
 
@@ -403,7 +404,39 @@ passwords in cleartext over the net to log in, either.
 This hole allowed ikiwiki to accept logins using empty passwords, to openid
 accounts that didn't use a password. It was introduced in version 1.34, and
 fixed in version 2.48. The [bug](http://bugs.debian.org/483770) was
-discovered on 30 May 2008 and fixed the same day. ([[cve CVE-2008-0169]])
+discovered on 30 May 2008 and fixed the same day. ([[!cve CVE-2008-0169]])
 
 I recommend upgrading to 2.48 immediatly if your wiki allows both password
 and openid logins.
+
+## Malformed UTF-8 DOS
+
+Feeding ikiwiki page sources containing certian forms of malformed UTF-8
+can cause it to crash. This can potentially be used for a denial of service
+attack.
+
+intrigeri discovered this problem on 12 Nov 2008 and a patch put in place
+later that day, in version 2.70. The fix was backported to testing as version
+2.53.3, and to stable as version 1.33.7.
+
+## Insufficient blacklisting in teximg plugin
+
+Josh Triplett discovered on 28 Aug 2009 that the teximg plugin's
+blacklisting of insecure TeX commands was insufficient; it could be
+bypassed and used to read arbitrary files. This was fixed by
+enabling TeX configuration options that disallow unsafe TeX commands.
+The fix was released on 30 Aug 2009 in version 3.1415926, and was
+backported to stable in version 2.53.4. If you use the teximg plugin,
+I recommend upgrading. ([[!cve CVE-2009-2944]])
+
+## javascript insertion via svg uris
+
+Ivan Shmakov pointed out that the htmlscrubber allowed `data:image/*` urls,
+including `data:image/svg+xml`. But svg can contain javascript, so that is
+unsafe.
+
+This hole was discovered on 12 March 2010 and fixed the same day
+with the release of ikiwiki 3.20100312.
+A fix was also backported to Debian etch, as version 2.53.5. I recommend
+upgrading to one of these versions if your wiki can be edited by third
+parties.