Vulnerability identifier: #VU29016

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12723

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 attacker to perform a denial of service (DoS) áttack.

The vulnerability exists due to a boundary error within the recursive "S_study_chunk" calls. A remote attacker can use a specially crafted regular expression , trigger memory corruption and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Perl: 5.30.0 - 5.30.2, 5.5 - 5.5.3, 5.4 - 5.4.5, 5.6 - 5.6.2, 5.18.4, 5.13.0 - 5.13.11, 5.10 - 5.10.1, 5.9.2, 5.8.0 - 5.8.10, 5.28.0 - 5.28.1, 5.24.0 - 5.24.1, 5.23.0 - 5.23.9, 5.26.0 - 5.26.2, 5.16, 5.15, 5.14.0 - 5.14.1, 5.12.0 - 5.12.3, 5.11.0 - 5.11.5, 5.22.2-1

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External links
http://github.com/Perl/perl5/blob/blead/pod/perl5303delta.pod
http://github.com/perl/perl5/commit/66bbb51b93253a3f87d11c2695cfb7bdb782184a
http://github.com/Perl/perl5/compare/v5.30.2...v5.30.3
http://github.com/Perl/perl5/issues/16947
http://github.com/Perl/perl5/issues/17743
http://security.gentoo.org/glsa/202006-03
http://security.netapp.com/advisory/ntap-20200611-0001/

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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.