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libxml2 - htmlCurrentChar Heap Based Buffer Overread
Source: https://code.google.com/p/google-security-research/issues/detail?id=636 The following crash due to a heap-based out-of-bounds memory read can be observed in an ASAN build of latest stable libxml2 (2.9.3, released 4 days ago), by feeding a malformed file to xmllint ("$ ./xmllint --html /path/to/file"): --- cut --- ==26202==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62100001c900 at pc 0x0000008073f9 bp 0x7ffd791c7f90 sp 0x7ffd791c7f88 READ of size 1 at 0x62100001c900 thread T0 #0 0x8073f8 in htmlCurrentChar libxml2-2.9.3/HTMLparser.c:439:6 #1 0x80ee62 in htmlParseCharDataInternal libxml2-2.9.3/HTMLparser.c:3011:8 #2 0x821b85 in htmlParseCharData libxml2-2.9.3/HTMLparser.c:3061:5 #3 0x7df875 in htmlParseContentInternal libxml2-2.9.3/HTMLparser.c:4634:3 #4 0x7e2f0f in htmlParseDocument libxml2-2.9.3/HTMLparser.c:4769:5 #5 0x802c55 in htmlDoRead libxml2-2.9.3/HTMLparser.c:6741:5 #6 0x8030b6 in htmlReadFile libxml2-2.9.3/HTMLparser.c:6799:13 #7 0x4f47a5 in parseAndPrintFile libxml2-2.9.3/xmllint.c:2248:8 #8 0x4ebe8f in main libxml2-2.9.3/xmllint.c:3759:7 0x62100001c900 is located 0 bytes to the right of 4096-byte region [0x62100001b900,0x62100001c900) allocated by thread T0 here: #0 0x4b8b68 in malloc llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:40 #1 0xa01a0c in xmlBufCreate libxml2-2.9.3/buf.c:137:32 #2 0x550aca in xmlSwitchInputEncodingInt libxml2-2.9.3/parserInternals.c:1205:34 #3 0x54f5ce in xmlSwitchToEncodingInt libxml2-2.9.3/parserInternals.c:1281:12 #4 0x54f278 in xmlSwitchEncoding libxml2-2.9.3/parserInternals.c:1101:11 #5 0x808eea in htmlCurrentChar libxml2-2.9.3/HTMLparser.c:518:13 #6 0x804a38 in htmlParseNameComplex libxml2-2.9.3/HTMLparser.c:2496:9 #7 0x7cc29d in htmlParseName libxml2-2.9.3/HTMLparser.c:2483:12 #8 0x7ec211 in htmlParseDocTypeDecl libxml2-2.9.3/HTMLparser.c:3424:12 #9 0x7debf4 in htmlParseContentInternal libxml2-2.9.3/HTMLparser.c:4585:3 #10 0x7e2f0f in htmlParseDocument libxml2-2.9.3/HTMLparser.c:4769:5 #11 0x802c55 in htmlDoRead libxml2-2.9.3/HTMLparser.c:6741:5 #12 0x8030b6 in htmlReadFile libxml2-2.9.3/HTMLparser.c:6799:13 #13 0x4f47a5 in parseAndPrintFile libxml2-2.9.3/xmllint.c:2248:8 #14 0x4ebe8f in main libxml2-2.9.3/xmllint.c:3759:7 SUMMARY: AddressSanitizer: heap-buffer-overflow libxml2-2.9.3/HTMLparser.c:439:6 in htmlCurrentChar Shadow bytes around the buggy address: 0x0c427fffb8d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c427fffb8e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c427fffb8f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c427fffb900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c427fffb910: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c427fffb920:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c427fffb930: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c427fffb940: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c427fffb950: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c427fffb960: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c427fffb970: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==26202==ABORTING --- cut --- The crash was reported at https://bugzilla.gnome.org/show_bug.cgi?id=758606. Attached is an XML file which triggers the crash. Proof of Concept: https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/39494.zip # 0day.today [2024-12-24] #