Created attachment 1291506 [details]
Triggered by "captoinfo POC3"

Description of problem:

In append_acs function(parse_entry.c:57), the value of tp->Strings[409] was written as  0xffffffffff  in the preceding function that led to  illegal address access crash. 

Version-Release number of selected component (if applicable):

<=6.0

How reproducible:

captoinfo $POC

Steps to Reproduce:

The debug information is as follows:


$gdb captoinfo
…
(gdb) set args $POC
(gdb) r
…
(gdb) bt
...
 #0 strlen () at ../sysdeps/x86_64/strlen.S:137 
#1 0x000000000043a99a in append_acs (code=120, src=0xffffffffffffffff <error: Cannot access memory at address 0xffffffffffffffff>, dst=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:574 
#2 postprocess_termcap (tp=<optimized out>, has_base=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:916
 #3 _nc_parse_entry (entryp=0x7fffffffaf88, literal=<optimized out>, silent=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:507 
#4 0x00000000004317d3 in _nc_read_entry_source (fp=<optimized out>, buf=<optimized out>, literal=0, silent=<optimized out>, hook=<optimized out>) at ../ncurses/./tinfo/comp_parse.c:227
 #5 0x0000000000402c57 in main (argc=<optimized out>, argv=<optimized out>) at ../progs/tic.c:929

Actual results:

crash

Expected results:

crash

Additional info:

Credits:

This vulnerability is detected by team OWL337, with our custom fuzzer coll AFL. Please contact ganshuitao  and chaoz.cn if you need more info about the team, the tool or the vulnerability.