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Bug 1547783 - (CVE-2018-6797) CVE-2018-6797 perl: heap write overflow in regcomp.c
CVE-2018-6797 perl: heap write overflow in regcomp.c
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20180414,repor...
: Security
Depends On: 1567800 1561100 1561101 1561102 1567778
Blocks: 1547784
  Show dependency tree / graph
 
Reported: 2018-02-21 18:03 EST by Laura Pardo
Modified: 2018-04-23 02:50 EDT (History)
17 users (show)

See Also:
Fixed In Version: perl 5.26.2, perl 5.24.4
Doc Type: If docs needed, set a value
Doc Text:
A heap buffer write overflow, with control over the bytes written, was found in the way regular expressions employing Unicode rules are compiled. An attacker, with the ability to provide a specially crafted regular expression, could crash the perl interpreter, or possibly execute arbitrary code.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:1192 None None None 2018-04-23 02:50 EDT

  None (edit)
Description Laura Pardo 2018-02-21 18:03:07 EST 
A flaw was found in Perl 5. A heap write overflow in regcomp.c file might be exploited when a perl program allows user input of patterns.  A crafted regular expression can cause the heap buffer overflow, with control over the bytes written.
Comment 1 Petr Pisar 2018-02-26 04:11:20 EST 
Reproducer:

$ perl -e 'qr/0b\N{U+41}\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF\xDF/i'
realloc(): invalid next size
Aborted (core dumped)
Comment 3 Petr Pisar 2018-03-26 06:38:51 EDT 
(In reply to Petr Pisar from comment #2)
> Perl 5 Porters published the fix for Perl 5.26.1 at:
> 
> <https://perl5.git.perl.org/perl.git/commit/
> 8e6f44c90c7fa1f63c19a44c45482b09a407e15b>
> <https://perl5.git.perl.org/perl.git/commit/
> fa889a389ebb8e63782a3697775aa42c63a8f0cd>
> <https://perl5.git.perl.org/perl.git/commit/
> 8b80ce67ff257aaa36e47eaf4194d27a51595524>
> <https://perl5.git.perl.org/perl.git/commit/
> ae187cb6c87b079045274f298fdcf426e4a6404b>
> 
> and in Perl-5.26.2-RC1 and 5.24.4-RC1 tar balls.

Sorry. These four patches were for CVE-2018-6798.

Perl 5 Porters published the CVE-2018-6797 fix for Perl 5.26.1 at https://perl5.git.perl.org/perl.git/commit/abe1e6c568b96bcb382dfa4f61c56d1ab001ea51 and in Perl-5.26.2-RC1 and 5.24.4-RC1 tar balls.
Comment 7 Cedric Buissart 2018-04-16 04:07:13 EDT 
Created perl tracking bugs for this issue:

Affects: fedora-all [bug 1567778]
Comment 9 Cedric Buissart 2018-04-16 07:26:57 EDT 
Statement:

Versions of the perl interpreter older than 5.18 are not vulnerable. As a result, the versions of perl as shipped in Red Hat Enterprise Linux version 7, 6 and 5 are not affected by this vulnerability.
Comment 10 Cedric Buissart 2018-04-16 07:27:07 EDT 
External References:

https://rt.perl.org/Public/Bug/Display.html?id=132227
Comment 14 Cedric Buissart 2018-04-18 10:32:31 EDT 
Acknowledgments:

Name: Perl 5 Porters
Upstream: Brian Carpenter
Comment 15 errata-xmlrpc 2018-04-23 02:50:46 EDT 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS

Via RHSA-2018:1192 https://access.redhat.com/errata/RHSA-2018:1192
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