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Fix infinite loops in QXmlStreamReader (CVE-2023-38197)

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Resolves: bz#2222771
This commit is contained in:
Jan Grulich 2023-07-21 11:17:14 +02:00
parent e7496ce04f
commit f21267bde2
3 changed files with 431 additions and 1 deletions
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203
CVE-2023-37369-qtbase-5.15.patch Normal file
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@ -0,0 +1,203 @@
diff --git a/src/corelib/serialization/qxmlstream.cpp b/src/corelib/serialization/qxmlstream.cpp
index 7cd457ba3a..11d162cb79 100644
--- a/src/corelib/serialization/qxmlstream.cpp
+++ b/src/corelib/serialization/qxmlstream.cpp
@@ -1302,15 +1302,18 @@ inline int QXmlStreamReaderPrivate::fastScanContentCharList()
return n;
}
-inline int QXmlStreamReaderPrivate::fastScanName(int *prefix)
+// Fast scan an XML attribute name (e.g. "xml:lang").
+inline QXmlStreamReaderPrivate::FastScanNameResult
+QXmlStreamReaderPrivate::fastScanName(Value *val)
{
int n = 0;
uint c;
while ((c = getChar()) != StreamEOF) {
if (n >= 4096) {
// This is too long to be a sensible name, and
- // can exhaust memory
- return 0;
+ // can exhaust memory, or the range of decltype(*prefix)
+ raiseNamePrefixTooLongError();
+ return {};
}
switch (c) {
case '\n':
@@ -1339,23 +1342,23 @@ inline int QXmlStreamReaderPrivate::fastScanName(int *prefix)
case '+':
case '*':
putChar(c);
- if (prefix && *prefix == n+1) {
- *prefix = 0;
+ if (val && val->prefix == n + 1) {
+ val->prefix = 0;
putChar(':');
--n;
}
- return n;
+ return FastScanNameResult(n);
case ':':
- if (prefix) {
- if (*prefix == 0) {
- *prefix = n+2;
+ if (val) {
+ if (val->prefix == 0) {
+ val->prefix = n + 2;
} else { // only one colon allowed according to the namespace spec.
putChar(c);
- return n;
+ return FastScanNameResult(n);
}
} else {
putChar(c);
- return n;
+ return FastScanNameResult(n);
}
Q_FALLTHROUGH();
default:
@@ -1364,12 +1367,12 @@ inline int QXmlStreamReaderPrivate::fastScanName(int *prefix)
}
}
- if (prefix)
- *prefix = 0;
+ if (val)
+ val->prefix = 0;
int pos = textBuffer.size() - n;
putString(textBuffer, pos);
textBuffer.resize(pos);
- return 0;
+ return FastScanNameResult(0);
}
enum NameChar { NameBeginning, NameNotBeginning, NotName };
@@ -1878,6 +1881,14 @@ void QXmlStreamReaderPrivate::raiseWellFormedError(const QString &message)
raiseError(QXmlStreamReader::NotWellFormedError, message);
}
+void QXmlStreamReaderPrivate::raiseNamePrefixTooLongError()
+{
+ // TODO: add a ImplementationLimitsExceededError and use it instead
+ raiseError(QXmlStreamReader::NotWellFormedError,
+ QXmlStream::tr("Length of XML attribute name exceeds implemnetation limits (4KiB "
+ "characters)."));
+}
+
void QXmlStreamReaderPrivate::parseError()
{
diff --git a/src/corelib/serialization/qxmlstream.g b/src/corelib/serialization/qxmlstream.g
index 4321fed68a..8c6a1a5887 100644
--- a/src/corelib/serialization/qxmlstream.g
+++ b/src/corelib/serialization/qxmlstream.g
@@ -516,7 +516,16 @@ public:
int fastScanLiteralContent();
int fastScanSpace();
int fastScanContentCharList();
- int fastScanName(int *prefix = nullptr);
+
+ struct FastScanNameResult {
+ FastScanNameResult() : ok(false) {}
+ explicit FastScanNameResult(int len) : addToLen(len), ok(true) { }
+ operator bool() { return ok; }
+ int operator*() { Q_ASSERT(ok); return addToLen; }
+ int addToLen;
+ bool ok;
+ };
+ FastScanNameResult fastScanName(Value *val = nullptr);
inline int fastScanNMTOKEN();
@@ -525,6 +534,7 @@ public:
void raiseError(QXmlStreamReader::Error error, const QString& message = QString());
void raiseWellFormedError(const QString &message);
+ void raiseNamePrefixTooLongError();
QXmlStreamEntityResolver *entityResolver;
@@ -1811,7 +1821,12 @@ space_opt ::= space;
qname ::= LETTER;
/.
case $rule_number: {
- sym(1).len += fastScanName(&sym(1).prefix);
+ Value &val = sym(1);
+ if (auto res = fastScanName(&val))
+ val.len += *res;
+ else
+ return false;
+
if (atEnd) {
resume($rule_number);
return false;
@@ -1822,7 +1837,11 @@ qname ::= LETTER;
name ::= LETTER;
/.
case $rule_number:
- sym(1).len += fastScanName();
+ if (auto res = fastScanName())
+ sym(1).len += *res;
+ else
+ return false;
+
if (atEnd) {
resume($rule_number);
return false;
diff --git a/src/corelib/serialization/qxmlstream_p.h b/src/corelib/serialization/qxmlstream_p.h
index e5bde7b98e..b01484cac3 100644
--- a/src/corelib/serialization/qxmlstream_p.h
+++ b/src/corelib/serialization/qxmlstream_p.h
@@ -1005,7 +1005,16 @@ public:
int fastScanLiteralContent();
int fastScanSpace();
int fastScanContentCharList();
- int fastScanName(int *prefix = nullptr);
+
+ struct FastScanNameResult {
+ FastScanNameResult() : ok(false) {}
+ explicit FastScanNameResult(int len) : addToLen(len), ok(true) { }
+ operator bool() { return ok; }
+ int operator*() { Q_ASSERT(ok); return addToLen; }
+ int addToLen;
+ bool ok;
+ };
+ FastScanNameResult fastScanName(Value *val = nullptr);
inline int fastScanNMTOKEN();
@@ -1014,6 +1023,7 @@ public:
void raiseError(QXmlStreamReader::Error error, const QString& message = QString());
void raiseWellFormedError(const QString &message);
+ void raiseNamePrefixTooLongError();
QXmlStreamEntityResolver *entityResolver;
@@ -1939,7 +1949,12 @@ bool QXmlStreamReaderPrivate::parse()
break;
case 262: {
- sym(1).len += fastScanName(&sym(1).prefix);
+ Value &val = sym(1);
+ if (auto res = fastScanName(&val))
+ val.len += *res;
+ else
+ return false;
+
if (atEnd) {
resume(262);
return false;
@@ -1947,7 +1962,11 @@ bool QXmlStreamReaderPrivate::parse()
} break;
case 263:
- sym(1).len += fastScanName();
+ if (auto res = fastScanName())
+ sym(1).len += *res;
+ else
+ return false;
+
if (atEnd) {
resume(263);
return false;

219
CVE-2023-38197-qtbase-5.15.patch Normal file
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@ -0,0 +1,219 @@
diff --git a/src/corelib/serialization/qxmlstream.cpp b/src/corelib/serialization/qxmlstream.cpp
index bf8a2a9..6ab5d49 100644
--- a/src/corelib/serialization/qxmlstream.cpp
+++ b/src/corelib/serialization/qxmlstream.cpp
@@ -160,7 +160,7 @@
addData() or by waiting for it to arrive on the device().
\value UnexpectedElementError The parser encountered an element
- that was different to those it expected.
+ or token that was different to those it expected.
*/
@@ -295,13 +295,34 @@
QXmlStreamReader is a well-formed XML 1.0 parser that does \e not
include external parsed entities. As long as no error occurs, the
- application code can thus be assured that the data provided by the
- stream reader satisfies the W3C's criteria for well-formed XML. For
- example, you can be certain that all tags are indeed nested and
- closed properly, that references to internal entities have been
- replaced with the correct replacement text, and that attributes have
- been normalized or added according to the internal subset of the
- DTD.
+ application code can thus be assured, that
+ \list
+ \li the data provided by the stream reader satisfies the W3C's
+ criteria for well-formed XML,
+ \li tokens are provided in a valid order.
+ \endlist
+
+ Unless QXmlStreamReader raises an error, it guarantees the following:
+ \list
+ \li All tags are nested and closed properly.
+ \li References to internal entities have been replaced with the
+ correct replacement text.
+ \li Attributes have been normalized or added according to the
+ internal subset of the \l DTD.
+ \li Tokens of type \l StartDocument happen before all others,
+ aside from comments and processing instructions.
+ \li At most one DOCTYPE element (a token of type \l DTD) is present.
+ \li If present, the DOCTYPE appears before all other elements,
+ aside from StartDocument, comments and processing instructions.
+ \endlist
+
+ In particular, once any token of type \l StartElement, \l EndElement,
+ \l Characters, \l EntityReference or \l EndDocument is seen, no
+ tokens of type StartDocument or DTD will be seen. If one is present in
+ the input stream, out of order, an error is raised.
+
+ \note The token types \l Comment and \l ProcessingInstruction may appear
+ anywhere in the stream.
If an error occurs while parsing, atEnd() and hasError() return
true, and error() returns the error that occurred. The functions
@@ -620,6 +641,7 @@
d->token = -1;
return readNext();
}
+ d->checkToken();
return d->type;
}
@@ -740,6 +762,14 @@
};
+static const char QXmlStreamReader_XmlContextString[] =
+ "Prolog\0"
+ "Body\0";
+
+static const short QXmlStreamReader_XmlContextString_indices[] = {
+ 0, 7
+};
+
/*!
\property QXmlStreamReader::namespaceProcessing
The namespace-processing flag of the stream reader
@@ -775,6 +805,16 @@
QXmlStreamReader_tokenTypeString_indices[d->type]);
}
+/*!
+ \internal
+ \return \param ctxt (Prolog/Body) as a string.
+ */
+QString contextString(QXmlStreamReaderPrivate::XmlContext ctxt)
+{
+ return QLatin1String(QXmlStreamReader_XmlContextString +
+ QXmlStreamReader_XmlContextString_indices[static_cast<int>(ctxt)]);
+}
+
#endif // QT_NO_XMLSTREAMREADER
QXmlStreamPrivateTagStack::QXmlStreamPrivateTagStack()
@@ -866,6 +906,8 @@
type = QXmlStreamReader::NoToken;
error = QXmlStreamReader::NoError;
+ currentContext = XmlContext::Prolog;
+ foundDTD = false;
}
/*
@@ -4061,6 +4103,92 @@
}
}
+static bool isTokenAllowedInContext(QXmlStreamReader::TokenType type,
+ QXmlStreamReaderPrivate::XmlContext loc)
+{
+ switch (type) {
+ case QXmlStreamReader::StartDocument:
+ case QXmlStreamReader::DTD:
+ return loc == QXmlStreamReaderPrivate::XmlContext::Prolog;
+
+ case QXmlStreamReader::StartElement:
+ case QXmlStreamReader::EndElement:
+ case QXmlStreamReader::Characters:
+ case QXmlStreamReader::EntityReference:
+ case QXmlStreamReader::EndDocument:
+ return loc == QXmlStreamReaderPrivate::XmlContext::Body;
+
+ case QXmlStreamReader::Comment:
+ case QXmlStreamReader::ProcessingInstruction:
+ return true;
+
+ case QXmlStreamReader::NoToken:
+ case QXmlStreamReader::Invalid:
+ return false;
+ default:
+ return false;
+ }
+}
+
+/*!
+ \internal
+ \brief QXmlStreamReader::isValidToken
+ \return \c true if \param type is a valid token type.
+ \return \c false if \param type is an unexpected token,
+ which indicates a non-well-formed or invalid XML stream.
+ */
+bool QXmlStreamReaderPrivate::isValidToken(QXmlStreamReader::TokenType type)
+{
+ // Don't change currentContext, if Invalid or NoToken occur in the prolog
+ if (type == QXmlStreamReader::Invalid || type == QXmlStreamReader::NoToken)
+ return false;
+
+ // If a token type gets rejected in the body, there is no recovery
+ const bool result = isTokenAllowedInContext(type, currentContext);
+ if (result || currentContext == XmlContext::Body)
+ return result;
+
+ // First non-Prolog token observed => switch context to body and check again.
+ currentContext = XmlContext::Body;
+ return isTokenAllowedInContext(type, currentContext);
+}
+
+/*!
+ \internal
+ Checks token type and raises an error, if it is invalid
+ in the current context (prolog/body).
+ */
+void QXmlStreamReaderPrivate::checkToken()
+{
+ Q_Q(QXmlStreamReader);
+
+ // The token type must be consumed, to keep track if the body has been reached.
+ const XmlContext context = currentContext;
+ const bool ok = isValidToken(type);
+
+ // Do nothing if an error has been raised already (going along with an unexpected token)
+ if (error != QXmlStreamReader::Error::NoError)
+ return;
+
+ if (!ok) {
+ raiseError(QXmlStreamReader::UnexpectedElementError,
+ QLatin1String("Unexpected token type %1 in %2.")
+ .arg(q->tokenString(), contextString(context)));
+ return;
+ }
+
+ if (type != QXmlStreamReader::DTD)
+ return;
+
+ // Raise error on multiple DTD tokens
+ if (foundDTD) {
+ raiseError(QXmlStreamReader::UnexpectedElementError,
+ QLatin1String("Found second DTD token in %1.").arg(contextString(context)));
+ } else {
+ foundDTD = true;
+ }
+}
+
/*!
\fn bool QXmlStreamAttributes::hasAttribute(const QString &qualifiedName) const
\since 4.5
diff --git a/src/corelib/serialization/qxmlstream_p.h b/src/corelib/serialization/qxmlstream_p.h
index 8f7c9e0..708059b 100644
--- a/src/corelib/serialization/qxmlstream_p.h
+++ b/src/corelib/serialization/qxmlstream_p.h
@@ -804,6 +804,17 @@
#endif
bool atEnd;
+ enum class XmlContext
+ {
+ Prolog,
+ Body,
+ };
+
+ XmlContext currentContext = XmlContext::Prolog;
+ bool foundDTD = false;
+ bool isValidToken(QXmlStreamReader::TokenType type);
+ void checkToken();
+
/*!
\sa setType()
*/

10
qt5-qtbase.spec
View File

@ -57,7 +57,7 @@ BuildRequires: pkgconfig(libsystemd)
Name: qt5-qtbase
Summary: Qt5 - QtBase components
Version: 5.15.9
Release: 6%{?dist}
Release: 7%{?dist}
# See LGPL_EXCEPTIONS.txt, for exception details
@ -147,6 +147,8 @@ Patch110: CVE-2023-32762-qtbase-5.15.patch
Patch111: CVE-2023-32763-qtbase-5.15.patch
Patch112: CVE-2023-33285-qtbase-5.15.patch
Patch113: CVE-2023-34410-qtbase-5.15.patch
Patch114: CVE-2023-37369-qtbase-5.15.patch
Patch115: CVE-2023-38197-qtbase-5.15.patch
# gating related patches
Patch200: qtbase-disable-tests-not-working-in-gating.patch
@ -434,6 +436,8 @@ Qt5 libraries used for drawing widgets and OpenGL items.
%patch -P111 -p1
%patch -P112 -p1
%patch -P113 -p1
%patch -P114 -p1
%patch -P115 -p1
## gating related patches
%patch -P200 -p1 -b .disable-tests-not-working-in-gating
@ -1134,6 +1138,10 @@ fi
%changelog
* Fri Jul 21 2023 Jan Grulich <jgrulich@redhat.com> - 5.15.9-7
- Fix infinite loops in QXmlStreamReader (CVE-2023-38197)
Resolves: bz#2222771
* Fri Jun 09 2023 Jan Grulich <jgrulich@redhat.com> - 5.15.9-6
- Don't allow remote attacker to bypass security restrictions caused by
flaw in certificate validation (CVE-2023-34410) (version #2)