Bug 1484299 - There is a heap overflow in liblouis which is triggered at function resolveSubtable().
Summary: There is a heap overflow in liblouis which is triggered at function resolveSu...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: liblouis
Version: 7.5-Alt
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: David King
QA Contact: Desktop QE
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-08-23 08:34 UTC by owl337
Modified: 2021-01-15 07:41 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-01-15 07:41:24 UTC
Target Upstream Version:


Attachments (Terms of Use)
Triggered by " ./lou_checktable POC2 " (428 bytes, application/x-rar)
2017-08-23 08:34 UTC, owl337
no flags Details

Description owl337 2017-08-23 08:34:26 UTC
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@gmail.com   and chaoz@tsinghua.edu.cn if you need more info about the team, the tool or the vulnerability.

Comment 4 RHEL Program Management 2021-01-15 07:41:24 UTC
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.


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