Vulnerability identifier: #VU2016

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-8853

CWE-ID: CWE-835

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Perl
Universal components / Libraries / Scripting languages

Vendor: Perl

Description
The vulnerability allows an adjacent attacker to cause DoS condition on the target system.

The weakness exists in the (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c due to infinite loop. An adjacent attacker can submit specially crafted utf-8 data, as demonstrated by "ax80", and cause the service to crash.

Mitigation
Update to version 5.24.0.

Vulnerable software versions

Perl: 5.23.0 - 5.23.9

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External links
http://perl5.git.perl.org/perl.git/commitdiff/22b433eff9a1ffa2454e18405a56650f07b385b5

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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