Vulnerability identifier: #VU32068

Vulnerability risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12883

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Perl
Universal components / Libraries / Scripting languages

Vendor: Perl

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

Buffer overflow in the S_grok_bslash_N function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to disclose sensitive information or cause a denial of service (application crash) via a crafted regular expression with an invalid 'N{U+...}' escape.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Perl: 0.5 - 0.95, 1.45, 2.5.0 - 2.5.1, 2.6.5, 2.8.5, 2.10.5, 2.11.5, 2.15.0 - 2.15.1, 5.4 - 5.4.5, 5.5 - 5.5.3, 5.6 - 5.6.2, 5.8.0 - 5.8.10, 5.9.2, 5.10 - 5.10.1, 5.11.0 - 5.11.5, 5.12.0 - 5.12.3, 5.13.0 - 5.13.11, 5.14.0 - 5.14.1, 5.15, 5.16, 5.18.4, 5.22.2-1, 5.23.0 - 5.23.9, 5.24.0 - 5.24.1, 5.26.0 - 5.26.2, 5.28.0 - 5.28.1, 5.30.0 - 5.30.3

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External links
http://mirror.cucumberlinux.com/cucumber/cucumber-1.0/source/lang-base/perl/patches/CVE-2017-12883.patch
http://www.debian.org/security/2017/dsa-3982
http://www.securityfocus.com/bid/100852
http://bugzilla.redhat.com/show_bug.cgi?id=1492093
http://perl5.git.perl.org/perl.git/commitdiff/2be4edede4ae226e2eebd4eff28cedd2041f300f#patch1
http://perl5.git.perl.org/perl.git/log/refs/tags/v5.24.3-RC1
http://perl5.git.perl.org/perl.git/log/refs/tags/v5.26.1-RC1
http://rt.perl.org/Public/Bug/Display.html?id=131598
http://security.netapp.com/advisory/ntap-20180426-0001/
http://www.oracle.com/security-alerts/cpujul2020.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.