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201 lines
7.8 KiB
201 lines
7.8 KiB
commit e8f285b522a907603501329e5b4212755f525fdf
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Author: Tomas Korbar <tkorbar@redhat.com>
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Date: Thu Mar 3 12:04:09 2022 +0100
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CVE-2022-25235
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diff --git a/lib/xmltok.c b/lib/xmltok.c
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index 6b415d8..b55732a 100644
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--- a/lib/xmltok.c
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+++ b/lib/xmltok.c
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@@ -103,13 +103,6 @@
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+ ((((byte)[2]) >> 5) & 1)] \
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& (1u << (((byte)[2]) & 0x1F)))
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-#define UTF8_GET_NAMING(pages, p, n) \
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- ((n) == 2 \
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- ? UTF8_GET_NAMING2(pages, (const unsigned char *)(p)) \
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- : ((n) == 3 \
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- ? UTF8_GET_NAMING3(pages, (const unsigned char *)(p)) \
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- : 0))
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-
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/* Detection of invalid UTF-8 sequences is based on Table 3.1B
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of Unicode 3.2: http://www.unicode.org/unicode/reports/tr28/
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with the additional restriction of not allowing the Unicode
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diff --git a/lib/xmltok_impl.c b/lib/xmltok_impl.c
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index 0403dd3..56d7a40 100644
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--- a/lib/xmltok_impl.c
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+++ b/lib/xmltok_impl.c
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@@ -61,7 +61,7 @@
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case BT_LEAD ## n: \
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if (end - ptr < n) \
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return XML_TOK_PARTIAL_CHAR; \
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- if (!IS_NAME_CHAR(enc, ptr, n)) { \
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+ if (IS_INVALID_CHAR(enc, ptr, n) || ! IS_NAME_CHAR(enc, ptr, n)) { \
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*nextTokPtr = ptr; \
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return XML_TOK_INVALID; \
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} \
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@@ -89,7 +89,7 @@
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case BT_LEAD ## n: \
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if (end - ptr < n) \
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return XML_TOK_PARTIAL_CHAR; \
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- if (!IS_NMSTRT_CHAR(enc, ptr, n)) { \
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+ if (IS_INVALID_CHAR(enc, ptr, n) || ! IS_NMSTRT_CHAR(enc, ptr, n)) { \
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*nextTokPtr = ptr; \
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return XML_TOK_INVALID; \
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} \
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@@ -1117,6 +1117,10 @@ PREFIX(prologTok)(const ENCODING *enc, const char *ptr, const char *end,
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case BT_LEAD ## n: \
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if (end - ptr < n) \
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return XML_TOK_PARTIAL_CHAR; \
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+ if (IS_INVALID_CHAR(enc, ptr, n)) { \
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+ *nextTokPtr = ptr; \
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+ return XML_TOK_INVALID; \
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+ } \
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if (IS_NMSTRT_CHAR(enc, ptr, n)) { \
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ptr += n; \
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tok = XML_TOK_NAME; \
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diff --git a/tests/runtests.c b/tests/runtests.c
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index 278bfa1..0f3afde 100644
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--- a/tests/runtests.c
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+++ b/tests/runtests.c
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@@ -6540,6 +6540,106 @@ START_TEST(test_utf8_in_cdata_section_2)
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}
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END_TEST
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+START_TEST(test_utf8_in_start_tags) {
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+ struct test_case {
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+ bool goodName;
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+ bool goodNameStart;
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+ const char *tagName;
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+ };
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+
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+ // The idea with the tests below is this:
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+ // We want to cover 1-, 2- and 3-byte sequences, 4-byte sequences
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+ // go to isNever and are hence not a concern.
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+ //
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+ // We start with a character that is a valid name character
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+ // (or even name-start character, see XML 1.0r4 spec) and then we flip
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+ // single bits at places where (1) the result leaves the UTF-8 encoding space
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+ // and (2) we stay in the same n-byte sequence family.
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+ //
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+ // The flipped bits are highlighted in angle brackets in comments,
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+ // e.g. "[<1>011 1001]" means we had [0011 1001] but we now flipped
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+ // the most significant bit to 1 to leave UTF-8 encoding space.
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+ struct test_case cases[] = {
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+ // 1-byte UTF-8: [0xxx xxxx]
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+ {true, true, "\x3A"}, // [0011 1010] = ASCII colon ':'
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+ {false, false, "\xBA"}, // [<1>011 1010]
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+ {true, false, "\x39"}, // [0011 1001] = ASCII nine '9'
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+ {false, false, "\xB9"}, // [<1>011 1001]
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+
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+ // 2-byte UTF-8: [110x xxxx] [10xx xxxx]
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+ {true, true, "\xDB\xA5"}, // [1101 1011] [1010 0101] =
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+ // Arabic small waw U+06E5
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+ {false, false, "\x9B\xA5"}, // [1<0>01 1011] [1010 0101]
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+ {false, false, "\xDB\x25"}, // [1101 1011] [<0>010 0101]
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+ {false, false, "\xDB\xE5"}, // [1101 1011] [1<1>10 0101]
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+ {true, false, "\xCC\x81"}, // [1100 1100] [1000 0001] =
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+ // combining char U+0301
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+ {false, false, "\x8C\x81"}, // [1<0>00 1100] [1000 0001]
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+ {false, false, "\xCC\x01"}, // [1100 1100] [<0>000 0001]
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+ {false, false, "\xCC\xC1"}, // [1100 1100] [1<1>00 0001]
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+
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+ // 3-byte UTF-8: [1110 xxxx] [10xx xxxx] [10xxxxxx]
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+ {true, true, "\xE0\xA4\x85"}, // [1110 0000] [1010 0100] [1000 0101] =
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+ // Devanagari Letter A U+0905
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+ {false, false, "\xA0\xA4\x85"}, // [1<0>10 0000] [1010 0100] [1000 0101]
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+ {false, false, "\xE0\x24\x85"}, // [1110 0000] [<0>010 0100] [1000 0101]
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+ {false, false, "\xE0\xE4\x85"}, // [1110 0000] [1<1>10 0100] [1000 0101]
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+ {false, false, "\xE0\xA4\x05"}, // [1110 0000] [1010 0100] [<0>000 0101]
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+ {false, false, "\xE0\xA4\xC5"}, // [1110 0000] [1010 0100] [1<1>00 0101]
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+ {true, false, "\xE0\xA4\x81"}, // [1110 0000] [1010 0100] [1000 0001] =
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+ // combining char U+0901
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+ {false, false, "\xA0\xA4\x81"}, // [1<0>10 0000] [1010 0100] [1000 0001]
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+ {false, false, "\xE0\x24\x81"}, // [1110 0000] [<0>010 0100] [1000 0001]
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+ {false, false, "\xE0\xE4\x81"}, // [1110 0000] [1<1>10 0100] [1000 0001]
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+ {false, false, "\xE0\xA4\x01"}, // [1110 0000] [1010 0100] [<0>000 0001]
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+ {false, false, "\xE0\xA4\xC1"}, // [1110 0000] [1010 0100] [1<1>00 0001]
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+ };
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+ const bool atNameStart[] = {true, false};
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+
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+ size_t i = 0;
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+ char doc[1024];
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+ size_t failCount = 0;
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+
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+ for (; i < sizeof(cases) / sizeof(cases[0]); i++) {
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+ size_t j = 0;
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+ for (; j < sizeof(atNameStart) / sizeof(atNameStart[0]); j++) {
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+ const bool expectedSuccess
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+ = atNameStart[j] ? cases[i].goodNameStart : cases[i].goodName;
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+ sprintf(doc, "<%s%s><!--", atNameStart[j] ? "" : "a", cases[i].tagName);
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+ XML_Parser parser = XML_ParserCreate(NULL);
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+
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+ const enum XML_Status status
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+ = XML_Parse(parser, doc, (int)strlen(doc), /*isFinal=*/XML_FALSE);
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+
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+ bool success = true;
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+ if ((status == XML_STATUS_OK) != expectedSuccess) {
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+ success = false;
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+ }
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+ if ((status == XML_STATUS_ERROR)
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+ && (XML_GetErrorCode(parser) != XML_ERROR_INVALID_TOKEN)) {
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+ success = false;
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+ }
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+
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+ if (! success) {
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+ fprintf(
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+ stderr,
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+ "FAIL case %2u (%sat name start, %u-byte sequence, error code %d)\n",
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+ (unsigned)i + 1u, atNameStart[j] ? " " : "not ",
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+ (unsigned)strlen(cases[i].tagName), XML_GetErrorCode(parser));
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+ failCount++;
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+ }
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+
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+ XML_ParserFree(parser);
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+ }
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+ }
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+
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+ if (failCount > 0) {
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+ fail("UTF-8 regression detected");
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+ }
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+}
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+END_TEST
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+
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+
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/* Test trailing spaces in elements are accepted */
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static void XMLCALL
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record_element_end_handler(void *userData,
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@@ -6734,6 +6834,15 @@ START_TEST(test_bad_doctype)
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}
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END_TEST
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+START_TEST(test_bad_doctype_utf8) {
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+ const char *text = "<!DOCTYPE \xDB\x25"
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+ "doc><doc/>"; // [1101 1011] [<0>010 0101]
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+ expect_failure(text, XML_ERROR_INVALID_TOKEN,
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+ "Invalid UTF-8 in DOCTYPE not faulted");
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+}
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+END_TEST
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+
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+
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START_TEST(test_bad_doctype_utf16)
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{
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const char text[] =
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@@ -12256,6 +12365,7 @@ make_suite(void)
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tcase_add_test(tc_basic, test_ext_entity_utf8_non_bom);
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tcase_add_test(tc_basic, test_utf8_in_cdata_section);
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tcase_add_test(tc_basic, test_utf8_in_cdata_section_2);
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+ tcase_add_test(tc_basic, test_utf8_in_start_tags);
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tcase_add_test(tc_basic, test_trailing_spaces_in_elements);
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tcase_add_test(tc_basic, test_utf16_attribute);
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tcase_add_test(tc_basic, test_utf16_second_attr);
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@@ -12264,6 +12374,7 @@ make_suite(void)
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tcase_add_test(tc_basic, test_bad_attr_desc_keyword);
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tcase_add_test(tc_basic, test_bad_attr_desc_keyword_utf16);
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tcase_add_test(tc_basic, test_bad_doctype);
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+ tcase_add_test(tc_basic, test_bad_doctype_utf8);
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tcase_add_test(tc_basic, test_bad_doctype_utf16);
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tcase_add_test(tc_basic, test_bad_doctype_plus);
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tcase_add_test(tc_basic, test_bad_doctype_star);
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