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Bug 1484285 - There is an illegal address access in function postprocess_termcap() of libncurses.
Summary: There is an illegal address access in function postprocess_termcap() of libn...
Keywords:
Status: CLOSED DUPLICATE of bug 1488918
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: ncurses
Version: 7.5-Alt
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Miroslav Lichvar
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
Depends On:
Blocks: CVE-2017-13731
TreeView+ depends on / blocked
 
Reported: 2017-08-23 07:59 UTC by owl337
Modified: 2018-07-27 15:24 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-07-27 15:24:32 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
Triggered by " ./tic POC10 " (99 bytes, application/x-rar)
2017-08-23 07:59 UTC, owl337 		no flags Details
View All

Description owl337 2017-08-23 07:59:56 UTC 
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.
Comment 2 Thomas E. Dickey 2017-08-26 00:35:53 UTC 
I made a fix for this report which will be in the next set of updates.
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