Bug 1464685
| Summary: | Null pointer dereference vulnerability in postprocess_termcap function of ncurses tool with latest verison(6.0) | ||||||
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| Product: | Red Hat Enterprise Linux 7 | Reporter: | owl337 <v.owl337> | ||||
| Component: | ncurses | Assignee: | Miroslav Lichvar <mlichvar> | ||||
| Status: | CLOSED DUPLICATE | QA Contact: | BaseOS QE - Apps <qe-baseos-apps> | ||||
| Severity: | urgent | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 7.5-Alt | CC: | dickey | ||||
| Target Milestone: | rc | Keywords: | Security | ||||
| Target Release: | --- | ||||||
| Hardware: | x86_64 | ||||||
| OS: | Linux | ||||||
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| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2017-06-29 08:03:18 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
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Severity medium (fix will appear in the weekly updates). 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 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 *** |
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.