Fix parsing of large tokens
Reject direct parameter entity recursion Resolves: RHEL-29699 Resolves: RHEL-29696
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Tomas Korbar
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1466
expat-2.5.0-CVE-2023-52425.patch
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1466
expat-2.5.0-CVE-2023-52425.patch
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172
expat-2.5.0-CVE-2024-28757.patch
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172
expat-2.5.0-CVE-2024-28757.patch
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@ -0,0 +1,172 @@
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commit cd3b344e0dbd19a812d0b4f34f9d089ed7c5c411
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Author: Tomas Korbar <tkorbar@redhat.com>
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Date: Tue Mar 19 15:12:18 2024 +0100
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Fix CVE-2024-28757
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Upstream PRs #841 and #842
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diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
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index 2ae64e9..0896b16 100644
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--- a/expat/lib/xmlparse.c
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+++ b/expat/lib/xmlparse.c
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@@ -6164,7 +6164,7 @@ storeEntityValue(XML_Parser parser, const ENCODING *enc,
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dtd->keepProcessing = dtd->standalone;
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goto endEntityValue;
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}
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- if (entity->open) {
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+ if (entity->open || (entity == parser->m_declEntity)) {
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if (enc == parser->m_encoding)
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parser->m_eventPtr = entityTextPtr;
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result = XML_ERROR_RECURSIVE_ENTITY_REF;
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@@ -7680,6 +7680,8 @@ copyString(const XML_Char *s, const XML_Memory_Handling_Suite *memsuite) {
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static float
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accountingGetCurrentAmplification(XML_Parser rootParser) {
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+ // 1.........1.........12 => 22
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+ const size_t lenOfShortestInclude = sizeof("<!ENTITY a SYSTEM 'b'>") - 1;
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const XmlBigCount countBytesOutput
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= rootParser->m_accounting.countBytesDirect
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+ rootParser->m_accounting.countBytesIndirect;
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@@ -7687,7 +7689,9 @@ accountingGetCurrentAmplification(XML_Parser rootParser) {
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= rootParser->m_accounting.countBytesDirect
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? (countBytesOutput
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/ (float)(rootParser->m_accounting.countBytesDirect))
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- : 1.0f;
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+ : ((lenOfShortestInclude
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+ + rootParser->m_accounting.countBytesIndirect)
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+ / (float)lenOfShortestInclude);
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assert(! rootParser->m_parentParser);
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return amplificationFactor;
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}
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diff --git a/expat/tests/runtests.c b/expat/tests/runtests.c
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index 941f61d..93adc45 100644
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--- a/expat/tests/runtests.c
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+++ b/expat/tests/runtests.c
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@@ -1788,6 +1788,48 @@ START_TEST(test_wfc_no_recursive_entity_refs) {
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}
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END_TEST
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+START_TEST(test_recursive_external_parameter_entity_2) {
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+ struct TestCase {
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+ const char *doc;
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+ enum XML_Status expectedStatus;
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+ };
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+
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+ struct TestCase cases[] = {
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+ {"<!ENTITY % p1 '%p1;'>", XML_STATUS_ERROR},
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+ {"<!ENTITY % p1 '%p1;'>"
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+ "<!ENTITY % p1 'first declaration wins'>",
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+ XML_STATUS_ERROR},
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+ {"<!ENTITY % p1 'first declaration wins'>"
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+ "<!ENTITY % p1 '%p1;'>",
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+ XML_STATUS_OK},
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+ {"<!ENTITY % p1 '%p1;'>", XML_STATUS_OK},
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+ };
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+
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+ for (size_t i = 0; i < sizeof(cases) / sizeof(cases[0]); i++) {
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+ const char *const doc = cases[i].doc;
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+ const enum XML_Status expectedStatus = cases[i].expectedStatus;
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+
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+ XML_Parser parser = XML_ParserCreate(NULL);
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+ assert_true(parser != NULL);
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+
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+ XML_Parser ext_parser = XML_ExternalEntityParserCreate(parser, NULL, NULL);
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+ assert_true(ext_parser != NULL);
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+
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+ const enum XML_Status actualStatus
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+ = _XML_Parse_SINGLE_BYTES(ext_parser, doc, (int)strlen(doc), XML_TRUE);
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+
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+ assert_true(actualStatus == expectedStatus);
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+ if (actualStatus != XML_STATUS_OK) {
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+ assert_true(XML_GetErrorCode(ext_parser)
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+ == XML_ERROR_RECURSIVE_ENTITY_REF);
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+ }
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+
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+ XML_ParserFree(ext_parser);
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+ XML_ParserFree(parser);
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+ }
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+}
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+END_TEST
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+
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/* Test incomplete external entities are faulted */
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START_TEST(test_ext_entity_invalid_parse) {
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const char *text = "<!DOCTYPE doc [\n"
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@@ -12719,6 +12761,60 @@ START_TEST(test_helper_unsigned_char_to_printable) {
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fail("unsignedCharToPrintable result mistaken");
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}
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END_TEST
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+
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+START_TEST(test_amplification_isolated_external_parser) {
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+ // NOTE: Length 44 is precisely twice the length of "<!ENTITY a SYSTEM 'b'>"
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+ // (22) that is used in function accountingGetCurrentAmplification in
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+ // xmlparse.c.
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+ // 1.........1.........1.........1.........1..4 => 44
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+ const char doc[] = "<!ENTITY % p1 '123456789_123456789_1234567'>";
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+ const int docLen = (int)sizeof(doc) - 1;
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+ const float maximumToleratedAmplification = 2.0f;
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+
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+ struct TestCase {
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+ int offsetOfThreshold;
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+ enum XML_Status expectedStatus;
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+ };
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+
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+ struct TestCase cases[] = {
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+ {-2, XML_STATUS_ERROR}, {-1, XML_STATUS_ERROR}, {0, XML_STATUS_ERROR},
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+ {+1, XML_STATUS_OK}, {+2, XML_STATUS_OK},
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+ };
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+
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+ for (size_t i = 0; i < sizeof(cases) / sizeof(cases[0]); i++) {
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+ const int offsetOfThreshold = cases[i].offsetOfThreshold;
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+ const enum XML_Status expectedStatus = cases[i].expectedStatus;
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+ const unsigned long long activationThresholdBytes
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+ = docLen + offsetOfThreshold;
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+
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+ XML_Parser parser = XML_ParserCreate(NULL);
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+ assert_true(parser != NULL);
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+
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+ assert_true(XML_SetBillionLaughsAttackProtectionMaximumAmplification(
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+ parser, maximumToleratedAmplification)
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+ == XML_TRUE);
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+ assert_true(XML_SetBillionLaughsAttackProtectionActivationThreshold(
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+ parser, activationThresholdBytes)
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+ == XML_TRUE);
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+
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+ XML_Parser ext_parser = XML_ExternalEntityParserCreate(parser, NULL, NULL);
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+ assert_true(ext_parser != NULL);
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+
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+ const enum XML_Status actualStatus
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+ = _XML_Parse_SINGLE_BYTES(ext_parser, doc, docLen, XML_TRUE);
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+
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+ assert_true(actualStatus == expectedStatus);
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+ if (actualStatus != XML_STATUS_OK) {
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+ assert_true(XML_GetErrorCode(ext_parser)
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+ == XML_ERROR_AMPLIFICATION_LIMIT_BREACH);
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+ }
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+
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+ XML_ParserFree(ext_parser);
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+ XML_ParserFree(parser);
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+ }
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+}
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+END_TEST
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+
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#endif // defined(XML_DTD)
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static Suite *
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@@ -12871,6 +12967,8 @@ make_suite(void) {
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tcase_add_test__ifdef_xml_dtd(tc_basic, test_skipped_parameter_entity);
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tcase_add_test__ifdef_xml_dtd(tc_basic,
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test_recursive_external_parameter_entity);
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+ tcase_add_test__ifdef_xml_dtd(tc_basic,
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+ test_recursive_external_parameter_entity_2);
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tcase_add_test(tc_basic, test_undefined_ext_entity_in_external_dtd);
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tcase_add_test(tc_basic, test_suspend_xdecl);
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tcase_add_test(tc_basic, test_abort_epilog);
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@@ -13120,6 +13218,7 @@ make_suite(void) {
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tcase_add_test(tc_accounting, test_accounting_precision);
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tcase_add_test(tc_accounting, test_billion_laughs_attack_protection_api);
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tcase_add_test(tc_accounting, test_helper_unsigned_char_to_printable);
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+ tcase_add_test(tc_accounting, test_amplification_isolated_external_parser);
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#endif
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return s;
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25
expat.spec
25
expat.spec
@ -3,12 +3,16 @@
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Summary: An XML parser library
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Name: expat
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Version: %(echo %{unversion} | sed 's/_/./g')
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Release: 1%{?dist}
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Release: 2%{?dist}
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Source: https://github.com/libexpat/libexpat/archive/R_%{unversion}.tar.gz#/expat-%{version}.tar.gz
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URL: https://libexpat.github.io/
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License: MIT
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BuildRequires: autoconf, libtool, xmlto, gcc-c++
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BuildRequires: make
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# https://issues.redhat.com/browse/RHEL-24227
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Patch0: expat-2.5.0-CVE-2023-52425.patch
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# https://issues.redhat.com/browse/RHEL-28700
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Patch1: expat-2.5.0-CVE-2024-28757.patch
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%description
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This is expat, the C library for parsing XML, written by James Clark. Expat
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@ -36,6 +40,10 @@ Install it if you need to link statically with expat.
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%prep
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%setup -q -n libexpat-R_%{unversion}/expat
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pushd ..
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%patch0 -p1 -b .CVE-2023-52425
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%patch1 -p1 -b .CVE-2024-28757
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popd
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sed -i 's/install-data-hook/do-nothing-please/' lib/Makefile.am
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./buildconf.sh
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@ -52,6 +60,15 @@ export DOCBOOK_TO_MAN="xmlto man --skip-validation"
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rm -f $RPM_BUILD_ROOT%{_libdir}/*.la
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%check
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bash -c "for i in {1..500000}; do printf AAAAAAAAAAAAAAAAAAAA >> achars.txt; done"
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for testfile in ../testdata/largefiles/aaaaaa_*; do
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first_part="$(sed 's/\(.*\)ACHARS.*/\1/g' $testfile)"
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second_part="$(sed 's/.*ACHARS\(.*\)/\1/g' $testfile)"
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printf "$first_part" > "$testfile"
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cat achars.txt >> "$testfile"
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printf "$second_part" >> "$testfile"
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done
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make check
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%ldconfig_scriptlets
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@ -74,6 +91,12 @@ make check
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%{_libdir}/lib*.a
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%changelog
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* Tue Feb 13 2024 Tomas Korbar <tkorbar@redhat.com> - 2.5.0-2
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- Fix parsing of large tokens
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- Reject direct parameter entity recursion
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- Resolves: RHEL-29699
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- Resolves: RHEL-29696
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* Thu Nov 10 2022 Tomas Korbar <tkorbar@redhat.com> - 2.5.0-1
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- Rebase to version 2.5.0
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- Resolves: CVE-2022-43680
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