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Bug 1464685 - Null pointer dereference vulnerability in postprocess_termcap function of ncurses tool with latest verison(6.0)
Summary: Null pointer dereference vulnerability in postprocess_termcap function of ncu...
Keywords:
Status: CLOSED DUPLICATE of bug 1464687
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: ncurses
Version: 7.5-Alt
Hardware: x86_64
OS: Linux
unspecified
urgent
Target Milestone: rc
: ---
Assignee: Miroslav Lichvar
QA Contact: BaseOS QE - Apps
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-06-24 14:23 UTC by owl337
Modified: 2017-06-29 08:03 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-06-29 08:03:18 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
Triggered by "captoinfo POC2" (107 bytes, application/x-rar)
2017-06-24 14:23 UTC, owl337
no flags Details

Description owl337 2017-06-24 14:23:28 UTC
Created attachment 1291505 [details]
Triggered by "captoinfo POC2"

Description of problem:

In  postprocess_termcap function(parse_entry.c:838), tp->Strings array was written using illegal value transmitted by crafted input that led to  Null pointer dereference. 

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 __strcmp_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:202 
#1 0x00000000004396e1 in postprocess_termcap (tp=<optimized out>, has_base=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:838 
#2 _nc_parse_entry (entryp=0x7fffffffaf88, literal=<optimized out>, silent=<optimized out>) at ../ncurses/./tinfo/parse_entry.c:507
 #3 0x0000000000431183 in _nc_read_entry_source (fp=<optimized out>, buf=<optimized out>, literal=0, silent=false, hook=0x0) at ../ncurses/./tinfo/comp_parse.c:227
 #4 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.

Comment 2 Thomas E. Dickey 2017-06-28 00:29:15 UTC
Severity medium (fix will appear in the weekly updates).

Comment 3 Thomas E. Dickey 2017-06-28 21:43:43 UTC
Two duplicates of this report were filed, and should be closed:

https://bugzilla.redhat.com/show_bug.cgi?id=1464687
https://bugzilla.redhat.com/show_bug.cgi?id=1464692

Comment 4 Miroslav Lichvar 2017-06-29 08:03:18 UTC
The two bugs seem to have a higher security impact, so even if the fix for this bug solves the other issues, I think it's better to close this one as a duplicate.

*** This bug has been marked as a duplicate of bug 1464687 ***


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