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Created attachment 1316978[details]
Triggered by " ./tic POC10 "
Description of problem:
There is an illegal address access in function postprocess_termcap() of libncurses.
Version-Release number of selected component (if applicable):
<= latest version
How reproducible:
./tic POC10
Steps to Reproduce:
$ ./tic POC10
Starting program: /home/icy/secreal/ncurses-6.0-20170819/install/bin/tic id:000142,sig:11,src:002264,op:havoc,rep:2
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': Illegal character - '^]'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': unknown capability 'b'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': Illegal character - '^M'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': wrong type used for string capability 'kdod'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 28, terminal 't': Missing separator after `do', have ,
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': Illegal character - '^J'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability '@V'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability `' in ko string
Program received signal SIGSEGV, Segmentation fault.
The GDB debugging information is as follows:
(gdb) set args POC4
(gdb) r
...
Starting program: /home/icy/secreal/ncurses-6.0-20170819/install/bin/tic id:000142,sig:11,src:002264,op:havoc,rep:2
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': Illegal character - '^]'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': unknown capability 'b'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': Illegal character - '^M'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': wrong type used for string capability 'kdod'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 28, terminal 't': Missing separator after `do', have ,
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': Illegal character - '^J'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability '@V'
"id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability `' in ko string
Breakpoint 1, postprocess_termcap (tp=<optimized out>, has_base=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:870
870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) {
(gdb) n
Program received signal SIGSEGV, Segmentation fault.
0x00000000004463ab in postprocess_termcap (tp=<optimized out>, has_base=<optimized out>)
at ../ncurses/./tinfo/parse_entry.c:870
870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) {
(gdb) bt
#0 0x00000000004463ab in postprocess_termcap (tp=<optimized out>, has_base=<optimized out>)
at ../ncurses/./tinfo/parse_entry.c:870
#1 _nc_parse_entry (entryp=0x7fffffffaf48, literal=<optimized out>, silent=<optimized out>)
at ../ncurses/./tinfo/parse_entry.c:520
#2 0x000000000043db23 in _nc_read_entry_source (fp=<optimized out>, buf=<optimized out>, literal=0, silent=false,
hook=0x40e230 <immedhook>) at ../ncurses/./tinfo/comp_parse.c:225
#3 0x0000000000403039 in main (argc=<optimized out>, argv=<optimized out>) at ../progs/tic.c:958
(gdb) list
865
866 /*
867 * The magic moment -- copy the mapped key string over,
868 * stripping out padding.
869 */
870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) {
871 if (bp[0] == '$' && bp[1] == '<') {
872 while (*bp && *bp != '>') {
873 ++bp;
874 }
(gdb)
Trigged in:
postprocess_termcap (tp=<optimized out>, has_base=<optimized out>)
at ../ncurses/./tinfo/parse_entry.c:870
870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) {
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.
Created attachment 1316978 [details] Triggered by " ./tic POC10 " Description of problem: There is an illegal address access in function postprocess_termcap() of libncurses. Version-Release number of selected component (if applicable): <= latest version How reproducible: ./tic POC10 Steps to Reproduce: $ ./tic POC10 Starting program: /home/icy/secreal/ncurses-6.0-20170819/install/bin/tic id:000142,sig:11,src:002264,op:havoc,rep:2 "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': Illegal character - '^]' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': unknown capability 'b' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': Illegal character - '^M' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': wrong type used for string capability 'kdod' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 28, terminal 't': Missing separator after `do', have , "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': Illegal character - '^J' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability '@V' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability `' in ko string Program received signal SIGSEGV, Segmentation fault. The GDB debugging information is as follows: (gdb) set args POC4 (gdb) r ... Starting program: /home/icy/secreal/ncurses-6.0-20170819/install/bin/tic id:000142,sig:11,src:002264,op:havoc,rep:2 "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': Illegal character - '^]' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 5, terminal 't': unknown capability 'b' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': Illegal character - '^M' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 24, terminal 't': wrong type used for string capability 'kdod' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 28, terminal 't': Missing separator after `do', have , "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': Illegal character - '^J' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability '@V' "id:000142,sig:11,src:002264,op:havoc,rep:2", line 1, col 31, terminal 't': unknown capability `' in ko string Breakpoint 1, postprocess_termcap (tp=<optimized out>, has_base=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:870 870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) { (gdb) n Program received signal SIGSEGV, Segmentation fault. 0x00000000004463ab in postprocess_termcap (tp=<optimized out>, has_base=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:870 870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) { (gdb) bt #0 0x00000000004463ab in postprocess_termcap (tp=<optimized out>, has_base=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:870 #1 _nc_parse_entry (entryp=0x7fffffffaf48, literal=<optimized out>, silent=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:520 #2 0x000000000043db23 in _nc_read_entry_source (fp=<optimized out>, buf=<optimized out>, literal=0, silent=false, hook=0x40e230 <immedhook>) at ../ncurses/./tinfo/comp_parse.c:225 #3 0x0000000000403039 in main (argc=<optimized out>, argv=<optimized out>) at ../progs/tic.c:958 (gdb) list 865 866 /* 867 * The magic moment -- copy the mapped key string over, 868 * stripping out padding. 869 */ 870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) { 871 if (bp[0] == '$' && bp[1] == '<') { 872 while (*bp && *bp != '>') { 873 ++bp; 874 } (gdb) Trigged in: postprocess_termcap (tp=<optimized out>, has_base=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:870 870 for (dp = buf2, bp = tp->Strings[from_ptr->nte_index]; *bp; bp++) { 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.