PERL-5.26.1 stack_overflow

[p5pRT]

Migrated from rt.perl.org#132609 (status was 'open')

Searchable as RT132609$

[p5pRT]

From sraums2498@gmail.com

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==38398==ERROR​: AddressSanitizer​: stack-overflow on address 0x7ffd8858afe8
(pc 0x000002e77260 bp 0x7ffd8858b0c0 sp 0x7ffd8858afe8 T0)
  #0 0x2e7725f in S_group_end
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/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
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/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
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  #39 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #40 0x2e871f3 in S_group_end
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/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
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  #44 0x2e871f3 in S_group_end
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  #56 0x2e871f3 in S_group_end
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  #57 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
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/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #178 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #179 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #180 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #181 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #182 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #183 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #184 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #185 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #186 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #187 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #188 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #189 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #190 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #191 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #192 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #193 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #194 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #195 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #196 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #197 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #198 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #199 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #200 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #201 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #202 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #203 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #204 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #205 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #206 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #207 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #208 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #209 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #210 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #211 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #212 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #213 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #214 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #215 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #216 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #217 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #218 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #219 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #220 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #221 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #222 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #223 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #224 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #225 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #226 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #227 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #228 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #229 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #230 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #231 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #232 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #233 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #234 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #235 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #236 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #237 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #238 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #239 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #240 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #241 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #242 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #243 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #244 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #245 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #246 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #247 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #248 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #249 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #250 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545
  #251 0x2e871f3 in S_group_end
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:545

SUMMARY​: AddressSanitizer​: stack-overflow
/home/asan_perl/Documents/perl-5.26.1/pp_pack.c​:531 S_group_end
==38398==ABORTING

--
Regards,
SRAUMS

[p5pRT]

From sraums2498@gmail.com

254

[p5pRT]

From @hvds

This reduces to​:
  ./miniperl -e 'pack "[" x 20000'
.. which explodes the stack because we check for close parens recursively in pack.c​:S_group_end()​:
  else if (c == '[')
  patptr = group_end(patptr, patend, ']') + 1;

The same happens for "(", for the same reason.

I don't think we class such things as vulnerabilities, can anyone confirm or deny?

I'm also not sure what would be involved in avoiding this, or if there's value in doing so.

Hugo

[p5pRT]

The RT System itself - Status changed from 'new' to 'open'

[p5pRT]

From zefram@fysh.org

Hugo van der Sanden via RT wrote​:

I don't think we class such things as vulnerabilities, can anyone
confirm or deny?

Confirmed, we don't consider busting the C stack to be a security failure.

-zefram

[p5pRT]

From @tonycoz

On Wed, 10 Jan 2018 18​:01​:19 -0800, zefram@​fysh.org wrote​:

Hugo van der Sanden via RT wrote​:

I don't think we class such things as vulnerabilities, can anyone
confirm or deny?

Confirmed, we don't consider busting the C stack to be a security failure.

Moved to the public queue.

Tony

[p5pRT]

From @mudongliang

Dear admin of perlbug,

I write this email to confirm whether you have received my perl bug
report : "Stack Exhaustion in current perl stable - 3.26.1".

And we need confirmation about this is really a bug to prove the power
of fuzzing tool. If you could response back to me as soon as possible,
I will really appreciate it.

--
My best regards to you.

  No System Is Safe!
  Dongliang Mu

[p5pRT]

From @mudongliang

---------- Forwarded message ----------
From​: <cve-request@​mitre.org>
Date​: Tue, Mar 20, 2018 at 1​:18 AM
Subject​: Re​: [scr480305] Perl - 5.26.1
To​: mudongliangabcd@​gmail.com
Cc​: cve-request@​mitre.org

-----BEGIN PGP SIGNED MESSAGE-----
Hash​: SHA256

The CVE ID is below. Please inform the software maintainer that the
CVE ID has been assigned.

[Suggested description]
An issue was discovered in Perl 5.26.1.
Stack Exhaustion occurs in checking regular expression for a "()" pair.
When Perl interprets one "(", it will allocate four stack
frames (S_reg, S_regbranch, S_regpiece, S_regatom) with a 0x9E0 length.
This mishandles the case of a length
longer than 3314.

------------------------------------------

[Vulnerability Type]
Buffer Overflow

------------------------------------------

[Vendor of Product]
Perl

------------------------------------------

[Affected Product Code Base]
Perl - 5.26.1

------------------------------------------

[Affected Component]
regcomp.c​:10569, S_reg, perl, miniperl

------------------------------------------

[Attack Type]
Local

------------------------------------------

[Impact Denial of Service]
true

------------------------------------------

[Attack Vectors]
To exploit this vulnerability, someone must use perl to execute one crafted file

------------------------------------------

[Discoverer]
Dongliang Mu

Use CVE-2018-8816.

- --
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http​://cve.mitre.org/cve/request_id.html ]
-----BEGIN PGP SIGNATURE-----
Version​: GnuPG v1

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=KXgN
-----END PGP SIGNATURE-----

[p5pRT]

From @tonycoz

On Mon, 19 Mar 2018 18​:43​:35 -0700, mudongliangabcd@​gmail.com wrote​:

Dear admin of perlbug,

I write this email to confirm whether you have received my perl bug
report : "Stack Exhaustion in current perl stable - 3.26.1".

And we need confirmation about this is really a bug to prove the power
of fuzzing tool. If you could response back to me as soon as possible,
I will really appreciate it.

I don't see any tickets with a subject matching "Stack Exhaustion in current perl stable - 3.26.1".

I do see ticket 133002, which has subject "Fwd​: [scr480305] Perl - 5.26.1" and is from you.

From a quick look this doesn't appear to be a security issue.

Tony

[p5pRT]

The RT System itself - Status changed from 'new' to 'open'

[p5pRT]

From @mudongliang

On Mon, Mar 26, 2018 at 7​:13 PM, Tony Cook via RT <
perl5-security-report-followup@​perl.org> wrote​:

On Mon, 19 Mar 2018 18​:43​:35 -0700, mudongliangabcd@​gmail.com wrote​:

Dear admin of perlbug,

I write this email to confirm whether you have received my perl bug
report : "Stack Exhaustion in current perl stable - 3.26.1".

And we need confirmation about this is really a bug to prove the power
of fuzzing tool. If you could response back to me as soon as possible,
I will really appreciate it.

I don't see any tickets with a subject matching "Stack Exhaustion in
current perl stable - 3.26.1".

I do see ticket 133002, which has subject "Fwd​: [scr480305] Perl -
5.26.1" and is from you.

From a quick look this doesn't appear to be a security issue.

First, thanks for your response.

Second, *Stack Exhaustion* is one kind of memory error vulnerability. At
least it could be leveraged to cause DoS.

From the log of AddressSanitizer, it is also verified as "Stack Overflow".

ASAN​:SIGSEGV

==27852==ERROR​: AddressSanitizer​: stack-overflow on address 0x7ffc14cabff8
(pc 0x0000005fd2bd bp 0x7ffc14cac270 sp 0x7ffc14cabff0 T0)
  #0 0x5fd2bc (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fd2bc)
  #1 0x5fdc41 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fdc41)
  #2 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
  #3 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
  #4 0x5fde1f (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fde1f)
  #5 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
  #6 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
  #7 0x5fde1f (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fde1f)
  #8 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
  #9 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
  #10 0x5fde1f (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fde1f)
  #11 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
  #12 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
  ......

It should be one security issue. And I could find one CVE(
http​://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2008-5314) with Stack
Exhausting type in the CVE Database.

If you have any question about this issue, please let me know.

Tony

[p5pRT]

From @iabyn

On Mon, Mar 26, 2018 at 07​:46​:08PM -0400, æ��å�¬äº® wrote​:

Second, *Stack Exhaustion* is one kind of memory error vulnerability. At
least it could be leveraged to cause DoS.

If the attacker is able to feed an attacker-specified regex pattern into
the perl interpreter, there are many, many ways of writing a regex which
will exhaust CPU or possibly even memory, e.g.

  $_ = "x" x 100;
  /.*.*.*.*.*.*.*.*[AB]/;

--
Indomitable in retreat, invincible in advance, insufferable in victory
  -- Churchill on Montgomery

[p5pRT]

From sraums2498@gmail.com

Maybe you are correct.
But all I can see here is, by not closing a bracket in a statement, if I
am able to corrupt the stack, I think it is easiest way to exploit the
target, which in our case here is perl.
So referring to the CVSS here​:
ease of exploit​: High (as we just need to leave a bracket open)
attack complexity​: almost nothing
As here, the perl is failing to sanitze this condition where bracket is not
closed, which is then further leading to stack corruption.
So I believe this is a security issue.

On Wed, Jan 24, 2018 at 4​:09 AM, Tony Cook via RT <perlbug-followup@​perl.org

wrote​:

On Wed, 10 Jan 2018 18​:01​:19 -0800, zefram@​fysh.org wrote​:

Hugo van der Sanden via RT wrote​:

I don't think we class such things as vulnerabilities, can anyone
confirm or deny?

Confirmed, we don't consider busting the C stack to be a security
failure.

Moved to the public queue.

Tony

--
Regards,
SRAUMS

[p5pRT]

From @tonycoz

On Mon, 26 Mar 2018 22​:10​:44 -0700, mudongliangabcd@​gmail.com wrote​:

On Mon, Mar 26, 2018 at 7​:13 PM, Tony Cook via RT <
perl5-security-report-followup@​perl.org> wrote​:

On Mon, 19 Mar 2018 18​:43​:35 -0700, mudongliangabcd@​gmail.com wrote​:

Dear admin of perlbug,

I write this email to confirm whether you have received my perl bug
report : "Stack Exhaustion in current perl stable - 3.26.1".

And we need confirmation about this is really a bug to prove the power
of fuzzing tool. If you could response back to me as soon as possible,
I will really appreciate it.

I don't see any tickets with a subject matching "Stack Exhaustion in
current perl stable - 3.26.1".

I do see ticket 133002, which has subject "Fwd​: [scr480305] Perl -
5.26.1" and is from you.

From a quick look this doesn't appear to be a security issue.

First, thanks for your response.

Second, *Stack Exhaustion* is one kind of memory error vulnerability. At
least it could be leveraged to cause DoS.

From the log of AddressSanitizer, it is also verified as "Stack Overflow".

ASAN​:SIGSEGV

==27852==ERROR​: AddressSanitizer​: stack-overflow on address 0x7ffc14cabff8
(pc 0x0000005fd2bd bp 0x7ffc14cac270 sp 0x7ffc14cabff0 T0)
#0 0x5fd2bc (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fd2bc)
#1 0x5fdc41 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fdc41)
#2 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
#3 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
#4 0x5fde1f (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fde1f)
#5 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
#6 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
#7 0x5fde1f (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fde1f)
#8 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
#9 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
#10 0x5fde1f (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5fde1f)
#11 0x5d3475 (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x5d3475)
#12 0x61ebbf (/home/mdl/revision/testsuites/perl-5.26.1/perl+0x61ebbf)
......

It should be one security issue. And I could find one CVE(
http​://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2008-5314) with Stack
Exhausting type in the CVE Database.

If you have any question about this issue, please let me know.

In the past we haven't treated the same issue as a security issue and we're unlikely to do so in the future.

I've (very briefly) discussed ways to mitigate this type of issue with Karl, but I haven't done anything specific on it, and Karl hasn't mentioned anything he's done on it.

Tony

[p5pRT]

The RT System itself - Status changed from 'new' to 'open'