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diff -up thunderbird-91.7.0/parser/expat/lib/xmlparse.c.expat-CVE-2022-25236 thunderbird-91.7.0/parser/expat/lib/xmlparse.c
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--- thunderbird-91.7.0/parser/expat/lib/xmlparse.c.expat-CVE-2022-25236 2022-03-02 18:08:40.085642028 +0100
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+++ thunderbird-91.7.0/parser/expat/lib/xmlparse.c 2022-03-02 18:13:31.838667958 +0100
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@@ -700,8 +700,7 @@ XML_ParserCreate(const XML_Char *encodin
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XML_Parser XMLCALL
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XML_ParserCreateNS(const XML_Char *encodingName, XML_Char nsSep)
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{
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- XML_Char tmp[2];
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- *tmp = nsSep;
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+ XML_Char tmp[2] = {nsSep, 0};
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return XML_ParserCreate_MM(encodingName, NULL, tmp);
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}
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#endif
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@@ -1276,8 +1275,7 @@ XML_ExternalEntityParserCreate(XML_Parse
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would be otherwise.
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*/
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if (ns) {
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- XML_Char tmp[2];
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- *tmp = namespaceSeparator;
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+ XML_Char tmp[2] = {parser->m_namespaceSeparator, 0};
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parser = parserCreate(encodingName, &parser->m_mem, tmp, newDtd);
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}
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else {
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@@ -3667,6 +3665,16 @@ addBinding(XML_Parser parser, PREFIX *pr
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if (!mustBeXML && isXMLNS
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&& (len > xmlnsLen || uri[len] != xmlnsNamespace[len]))
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isXMLNS = XML_FALSE;
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+ // NOTE: While Expat does not validate namespace URIs against RFC 3986,
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+ // we have to at least make sure that the XML processor on top of
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+ // Expat (that is splitting tag names by namespace separator into
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+ // 2- or 3-tuples (uri-local or uri-local-prefix)) cannot be confused
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+ // by an attacker putting additional namespace separator characters
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+ // into namespace declarations. That would be ambiguous and not to
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+ // be expected.
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+ if (parser->m_ns && (uri[len] == parser->m_namespaceSeparator)) {
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+ return XML_ERROR_SYNTAX;
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+ }
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}
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isXML = isXML && len == xmlLen;
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isXMLNS = isXMLNS && len == xmlnsLen;
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