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authorJonas Schäfer <jonas@wielicki.name>2022-01-10 18:23:54 +0100
committerJonas Schäfer <jonas@wielicki.name>2022-01-10 18:23:54 +0100
commit23a43df6fb5d3928c66f90d5c4475bca15694673 (patch)
treec5337f44369018f06992386bc07d16da8ae3b466 /spec/json/fail15.json
parente812ce9b4ad71e8882a2ed12e720b1fd4e3189f7 (diff)
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util.xml: Do not allow doctypes, comments or processing instructions0.11.12
Yes. This is as bad as it sounds. CVE pending. In Prosody itself, this only affects mod_websocket, which uses util.xml to parse the <open/> frame, thus allowing unauthenticated remote DoS using Billion Laughs. However, third-party modules using util.xml may also be affected by this. This commit installs handlers which disallow the use of doctype declarations and processing instructions without any escape hatch. It, by default, also introduces such a handler for comments, however, there is a way to enable comments nontheless. This is because util.xml is used to parse human-facing data, where comments are generally a desirable feature, and also because comments are generally harmless.
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