RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Created attachment 1291504 [details]
Triggered by  "captoinfo POC1"

Description of problem:

As ncurses/tinfo/comp_scan.c made lexical scanning，the nc_curr_token.tk_valstring(line:400) was initialized to Null by crafted input. It  led to  denial of service(crash) when the variable was transferred to _nc_save_str function as Null pointer. 

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


How reproducible:

captoinfo $POC

Steps to Reproduce:

$gdb captoinfo
…
(gdb) set args $POC
(gdb) r
…
(gdb) bt
 #0 strlen () at ../sysdeps/x86_64/strlen.S:106 
#1 0x0000000000446c1a in _nc_save_str (string=0x0) at ../ncurses/./tinfo/alloc_entry.c:99
 #2 0x0000000000437037 in _nc_parse_entry (entryp=0x7fffffffaf98, literal=0, silent=false) at ../ncurses/./tinfo/parse_entry.c:463 
#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:

Severity medium (fix will appear in the weekly updates).

As this issue seems to have a very low impact, it's currently not planned to be fixed in RHEL 7.