Bug 1484299
| Summary: | There is a heap overflow in liblouis which is triggered at function resolveSubtable(). | ||||||
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| Product: | Red Hat Enterprise Linux 7 | Reporter: | owl337 <v.owl337> | ||||
| Component: | liblouis | Assignee: | David King <dking> | ||||
| Status: | CLOSED WONTFIX | QA Contact: | Desktop QE <desktop-qa-list> | ||||
| Severity: | unspecified | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 7.5-Alt | CC: | mclasen | ||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2021-01-15 07:41:24 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Attachments: |
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After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened. |
Created attachment 1316989 [details] Triggered by " ./lou_checktable POC2 " Description of problem: There is a heap overflow in liblouis which is triggered at function resolveSubtable(). Version-Release number of selected component (if applicable): <= latest version How reproducible: ./lou_checktable POC2 Steps to Reproduce: Normal output: $ ./lou_checktable POC2 POC2:2: error: opcode 'incJude' not defined. Segmentation fault The GDB && ASAN debugging information is as follows: gdb-peda$ r ... Breakpoint 2, resolveSubtable (base=0x60200000ef90 "POC7", searchPath=<optimized out>, table=<optimized out>) at compileTranslationTable.c:5030 5030 sprintf (tableFile, "%s%c%s", dir, DIR_SEP, table); gdb-peda$ p tableFile $3 = 0x61d00001d680 "brai", ';' <repeats 78 times>, 'd' <repeats 118 times>... gdb-peda$ bt #0 resolveSubtable (base=0x60200000ef90 "POC2", searchPath=<optimized out>, table=<optimized out>) at compileTranslationTable.c:5030 #1 _lou_defaultTableResolver (tableList=<optimized out>, base=<optimized out>) at compileTranslationTable.c:5125 #2 0x00007ffff7b2cc42 in _lou_resolveTable (base=0x7ffff7fd9778 "a\036", tableList=<optimized out>) at compileTranslationTable.c:5169 #3 includeFile (nested=<optimized out>, includedFile=<optimized out>, characterClasses=<optimized out>, characterClassAttribute=<optimized out>, opcodeLengths=<optimized out>, newRuleOffset=<optimized out>, newRule=<optimized out>, ruleNames=<optimized out>) at compileTranslationTable.c:5250 #4 compileRule (nested=<optimized out>, characterClasses=<optimized out>, characterClassAttribute=<optimized out>, opcodeLengths=<optimized out>, newRuleOffset=<optimized out>, newRule=<optimized out>, ruleNames=<optimized out>) at compileTranslationTable.c:3838 #5 0x00007ffff7b5e548 in compileFile (fileName=<optimized out>, characterClasses=<optimized out>, characterClassAttribute=<optimized out>, opcodeLengths=<optimized out>, newRuleOffset=<optimized out>, newRule=<optimized out>, ruleNames=<optimized out>) at compileTranslationTable.c:5208 #6 0x00007ffff7b1a80e in compileTranslationTable (tableList=<optimized out>, characterClasses=<optimized out>, characterClassAttribute=<optimized out>, opcodeLengths=<optimized out>, newRuleOffset=<optimized out>, newRule=<optimized out>, ruleNames=<optimized out>) at compileTranslationTable.c:5316 #7 lou_getTable (tableList=<optimized out>) at compileTranslationTable.c:5419 #8 0x00000000004dbcb0 in main (argc=<optimized out>, argv=<optimized out>, argv@entry=0x7fffffffe578) at lou_checktable.c:121 #9 0x00007ffff6c10ac0 in __libc_start_main (main=0x4dbb00 <main>, argc=0x2, argv=0x7fffffffe578, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe568) at libc-start.c:289 #10 0x0000000000435749 in _start () gdb-peda$ n ================================================================= ==112580==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61d00001de80 at pc 0x00000044aca8 bp 0x7ffffff7d620 sp 0x7ffffff7cdb0 WRITE of size 2102 at 0x61d00001de80 thread T0 #0 0x44aca7 (/home/icy/secreal/liblouis/install_asan/bin/lou_checktable+0x44aca7) #1 0x44bffe (/home/icy/secreal/liblouis/install_asan/bin/lou_checktable+0x44bffe) #2 0x7ffff7b17ce7 (/home/icy/secreal/liblouis/install_asan/lib/liblouis.so.14+0x14ce7) #3 0x7ffff7b2cc41 (/home/icy/secreal/liblouis/install_asan/lib/liblouis.so.14+0x29c41) #4 0x7ffff7b5e547 (/home/icy/secreal/liblouis/install_asan/lib/liblouis.so.14+0x5b547) #5 0x7ffff7b1a80d (/home/icy/secreal/liblouis/install_asan/lib/liblouis.so.14+0x1780d) #6 0x4dbcaf (/home/icy/secreal/liblouis/install_asan/bin/lou_checktable+0x4dbcaf) #7 0x7ffff6c10abf (/lib/x86_64-linux-gnu/libc.so.6+0x20abf) #8 0x435748 (/home/icy/secreal/liblouis/install_asan/bin/lou_checktable+0x435748) 0x61d00001de80 is located 0 bytes to the right of 2048-byte region [0x61d00001d680,0x61d00001de80) allocated by thread T0 here: #0 0x4bc712 (/home/icy/secreal/liblouis/install_asan/bin/lou_checktable+0x4bc712) #1 0x7ffff7b17883 (/home/icy/secreal/liblouis/install_asan/lib/liblouis.so.14+0x14883) Shadow bytes around the buggy address: 0x0c3a7fffbb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c3a7fffbb90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c3a7fffbba0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c3a7fffbbb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c3a7fffbbc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c3a7fffbbd0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c3a7fffbbe0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c3a7fffbbf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c3a7fffbc00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c3a7fffbc10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c3a7fffbc20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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 ==112580==ABORTING [Inferior 1 (process 112580) exited with code 01] Warning: not running or target is remote gdb-peda$ The vulnerability was triggered in function: resolveSubtable (base=0x60200000ef90 "POC7", searchPath=<optimized out>, table=<optimized out>) at compileTranslationTable.c:5030 5025 ; 5026 last = (*cp == '\0'); 5027 *cp = '\0'; 5028 if (dir == cp) 5029 dir = "."; 5030 sprintf (tableFile, "%s%c%s", dir, DIR_SEP, table); 5031 if (stat (tableFile, &info) == 0 && !(info.st_mode & S_IFDIR)) 5032 { 5033 _lou_logMessage(LOG_DEBUG, "found table %s", tableFile); 5034 free(searchPath_copy); Actual results: crash Expected results: crash Additional info: Credits: This vulnerability is detected by team OWL337, with our custom fuzzer collAFL. Please contact ganshuitao and chaoz.cn if you need more info about the team, the tool or the vulnerability.