I am having some issue searching Bugzilla for any issue involving
process_regexp in mod_headers.c .
It finds nothing, so I am assuming I did something wrong in my search. Will
file bug if not already filed.
We are investigating an infinite loop (stack overflow) issue, caused by
"securing" a system.
ZZZ-STIG-SV-214288r881493_rule.conf:Header always edit* Set-Cookie ^(.*)$
$1;HttpOnly;secure
Note: the STIG is "bad", The PHP code was "weird" sending an empty Set-Cookie
header. Using .+ bypasses the infinite loop of input = substation caused by
matching and replacing an empty string.
I am available for debugging this until fixed. Opinions welcomed. It is
currently mitigated.
I can test, and we will attempt to patch.
OS : RHEL 8 x86_64
Name : httpd
Version : 2.4.37
Release : 62.module+el8.9.0+19699+7a7a2044
/var/log/httpd/error_log:[Thu Jan 04 18:43:23.469536 2024] [core:notice] [pid
1319:tid 140078043187520] AH00051: child pid 1364 exit signal Segmentation
fault (11), possible coredump in /var/log/httpd/core/
#0 0x00007f6675b9eef1 in match (eptr=eptr@entry=0x7f6628013b45 "",
ecode=0x559019b00a79 "U\rx", mstart=mstart@entry=0x7f6628013b45 "",
offset_top=offset_top@entry=2, md=md@entry=0x7f663e7fe410,
eptrb=eptrb@entry=0x0, rdepth=1) at pcre_exec.c:522
#1 0x00007f6675ba146b in match (eptr=<optimized out>,
eptr@entry=0x7f6628013b45 "", ecode=0x559019b00a74 "\205",
mstart=mstart@entry=0x7f6628013b45 "", offset_top=offset_top@entry=2,
md=md@entry=0x7f663e7fe410,
eptrb=eptrb@entry=0x0, rdepth=<optimized out>) at pcre_exec.c:989
#2 0x00007f6675bb0651 in pcre_exec (argument_re=0x559019b00a30,
extra_data=extra_data@entry=0x0, subject=0x7f6628013b45 "", length=0,
start_offset=start_offset@entry=0, options=options@entry=0,
offsets=0x7f663e7fe590, offsetcount=30) at pcre_exec.c:6942
#3 0x0000559018576a69 in ap_regexec_len (preg=0x559019ac4de0,
buff=buff@entry=0x7f6628013b45 "", len=<optimized out>, nmatch=nmatch@entry=10,
pmatch=pmatch@entry=0x7f663e7fe650, eflags=eflags@entry=0)
at util_pcre.c:252
#4 0x0000559018576c32 in ap_regexec (preg=<optimized out>,
string=string@entry=0x7f6628013b45 "", nmatch=nmatch@entry=10,
pmatch=pmatch@entry=0x7f663e7fe650, eflags=eflags@entry=0) at util_pcre.c:219
#5 0x00007f666db7dcce in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:642
#6 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#7 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#8 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#9 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#10 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#11 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#12 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#13 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#14 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#15 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#16 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#17 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#18 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
...
#52318 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52319 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52320 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52321 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52322 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52323 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52324 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52325 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52326 0x00007f666db7dd62 in process_regexp (hdr=hdr@entry=0x559019a10d58,
value=value@entry=0x7f6628013b45 "", r=r@entry=0x7f662800e250) at
mod_headers.c:657
#52327 0x00007f666db7dd62 in process_regexp (hdr=0x559019a10d58,
value=0x7f6628013af0 "MoodleSession=dm5ob7kn4olvp5e5i72u9ctddr; path=/lms/;
secure; HttpOnly; SameSite=None", r=0x7f662800e250) at mod_headers.c:657
#52328 0x00007f666db7de0f in edit_header (v=v@entry=0x7f663effa5f0,
key=key@entry=0x7f6628013ae0 "Set-Cookie", val=<optimized out>) at
mod_headers.c:686
#52329 0x00007f6674d5e93f in apr_table_vdo (comp=0x7f666db7ddf0 <edit_header>,
rec=0x7f663effa5f0, t=0x7f66280141c8, vp=vp@entry=0x7f663effa4c0) at
tables/apr_tables.c:981
#52330 0x00007f6674d5ea93 in apr_table_do (comp=comp@entry=0x7f666db7ddf0
<edit_header>, rec=rec@entry=0x7f663effa5f0, t=t@entry=0x7f66280141c8) at
tables/apr_tables.c:925
#52331 0x00007f666db7e063 in do_headers_fixup (r=0x7f662800e250,
headers=0x7f66280141c8, early=early@entry=0, fixup=<optimized out>,
fixup=<optimized out>) at mod_headers.c:829
#52332 0x00007f666db7e659 in ap_headers_output_filter (f=0x7f66280115d0,
in=0x7f66280136f0) at mod_headers.c:878
#52333 0x00007f6666c12fe2 in session_output_filter (f=0x7f66280115a8,
in=0x7f66280136f0) at mod_session.c:492
#52334 0x00007f6668a178b6 in dispatch (conn=conn@entry=0x559019b7c110,
conf=conf@entry=0x559019a334c0, r=r@entry=0x7f662800e250,
setaside_pool=0x7f6628005098, err=err@entry=0x7f663effc900,
bad_request=bad_request@entry=0x7f663effc8c8, has_responded=0x7f663effc8cc,
input_brigade=0x7f6628011848, request_id=1) at mod_proxy_fcgi.c:839
#52335 0x00007f6668a18a6f in fcgi_do_request (p=<optimized out>, origin=0x0,
uri=<optimized out>, url=<optimized out>, input_brigade=0x7f6628011848,
server_portstr=0x7f663effc970 "", conf=0x559019a334c0, conn=0x559019b7c110,
r=0x7f662800e250) at mod_proxy_fcgi.c:981
#52336 proxy_fcgi_handler (r=0x7f662800e250, worker=<optimized out>,
conf=<optimized out>, url=<optimized out>, proxyname=<optimized out>,
proxyport=<optimized out>) at mod_proxy_fcgi.c:1195
#52337 0x00007f6669c5b6c4 in proxy_run_scheme_handler
(r=r@entry=0x7f662800e250, worker=0x559019a3ed28,
conf=conf@entry=0x559019a2eeb0, url=0x7f6628011740
"fcgi://localhost/var/www/html/lms/admin/index.php",
proxyhost=proxyhost@entry=0x0, proxyport=proxyport@entry=0) at mod_proxy.c:3125
#52338 0x00007f6669c5c479 in proxy_handler (r=0x7f662800e250) at
mod_proxy.c:1267
#52339 0x00005590185922c8 in ap_run_handler (r=r@entry=0x7f662800e250) at
config.c:170
#52340 0x0000559018592886 in ap_invoke_handler (r=r@entry=0x7f662800e250) at
config.c:444
#52341 0x00005590185a9a83 in ap_process_async_request
(r=r@entry=0x7f662800e250) at http_request.c:453
#52342 0x00005590185a5ed0 in ap_process_http_async_connection
(c=0x7f65e4000f88) at http_core.c:154
#52343 ap_process_http_connection (c=0x7f65e4000f88) at http_core.c:248
#52344 0x000055901859c2b8 in ap_run_process_connection
(c=c@entry=0x7f65e4000f88) at connection.c:42
#52345 0x00007f6669e79a47 in process_socket (thd=thd@entry=0x559019b7b278,
p=<optimized out>, sock=<optimized out>, cs=0x7f65e4000ee0,
my_child_num=my_child_num@entry=1, my_thread_num=my_thread_num@entry=3) at
event.c:1049
#52346 0x00007f6669e7a3ea in worker_thread (thd=0x559019b7b278,
dummy=<optimized out>) at event.c:2083
#52347 0x00007f6674b2d1ca in start_thread (arg=<optimized out>) at
pthread_create.c:479
#52348 0x00007f6674595e73 in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
./modules/metadata/mod_headers.c:
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 634) static const
char *process_regexp(header_entry *hdr, const char *value,
e8a15ec117f (Jim Jagielski 2013-11-09 14:37:23 +0000 635)
request_rec *r)
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 636) {
b9196c6dfd5 (Stefan Fritsch 2011-10-18 20:51:35 +0000 637)
ap_regmatch_t pmatch[AP_MAX_REG_MATCH];
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 638) const char
*subs;
76ea26f7a0a (Nick Kew 2009-12-27 00:05:12 +0000 639) const char
*remainder;
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 640) char *ret;
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 641) int diffsz;
b9196c6dfd5 (Stefan Fritsch 2011-10-18 20:51:35 +0000 642) if
(ap_regexec(hdr->regex, value, AP_MAX_REG_MATCH, pmatch, 0)) {
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 643) /* no
match, nothing to do */
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 644) return
value;
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 645) }
e8a15ec117f (Jim Jagielski 2013-11-09 14:37:23 +0000 646) /* Process
tags in the input string rather than the resulting
e8a15ec117f (Jim Jagielski 2013-11-09 14:37:23 +0000 647) *
substitution to avoid surprises
e8a15ec117f (Jim Jagielski 2013-11-09 14:37:23 +0000 648) */
e8a15ec117f (Jim Jagielski 2013-11-09 14:37:23 +0000 649) subs =
ap_pregsub(r->pool, process_tags(hdr, r), value, AP_MAX_REG_MATCH, pmatch);
646971c2148 (Stefan Fritsch 2011-11-07 21:29:57 +0000 650) if (subs ==
NULL)
646971c2148 (Stefan Fritsch 2011-11-07 21:29:57 +0000 651) return
NULL;
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 652) diffsz =
strlen(subs) - (pmatch[0].rm_eo - pmatch[0].rm_so);
76ea26f7a0a (Nick Kew 2009-12-27 00:05:12 +0000 653) if
(hdr->action == hdr_edit) {
76ea26f7a0a (Nick Kew 2009-12-27 00:05:12 +0000 654)
remainder = value + pmatch[0].rm_eo;
76ea26f7a0a (Nick Kew 2009-12-27 00:05:12 +0000 655) }
76ea26f7a0a (Nick Kew 2009-12-27 00:05:12 +0000 656) else { /*
recurse to edit multiple matches if applicable */
e8a15ec117f (Jim Jagielski 2013-11-09 14:37:23 +0000 657)
remainder = process_regexp(hdr, value + pmatch[0].rm_eo, r);
646971c2148 (Stefan Fritsch 2011-11-07 21:29:57 +0000 658) if
(remainder == NULL)
646971c2148 (Stefan Fritsch 2011-11-07 21:29:57 +0000 659)
return NULL;
76ea26f7a0a (Nick Kew 2009-12-27 00:05:12 +0000 660) diffsz
+= strlen(remainder) - strlen(value + pmatch[0].rm_eo);
76ea26f7a0a (Nick Kew 2009-12-27 00:05:12 +0000 661) }
e8a15ec117f (Jim Jagielski 2013-11-09 14:37:23 +0000 662) ret =
apr_palloc(r->pool, strlen(value) + 1 + diffsz);
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 663) memcpy(ret,
value, pmatch[0].rm_so);
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 664) strcpy(ret
+ pmatch[0].rm_so, subs);
8dfbc67165e (Nick Kew 2010-07-21 00:20:43 +0000 665) strcat(ret,
remainder);
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 666) return ret;
4034b23cc0d (Nick Kew 2006-10-03 07:41:27 +0000 667) }
--
Jason Pyeron | Security Architect
Contractor | ISSO|IAT-III/IAM-III/IASAE-III
PD Inc | CAGE Code: 1WVR6
10 w 24th St | Certified SBA 8(a)
Baltimore, MD | Certified SBA HUBZone
.mil: jason.j.pyeron....@mail.mil
.com: jpye...@pdinc.us
tel : 202-741-9397
