Perl up to 5.24.2/5.26.0 win32/perlhost.h CPerlHost::Add Environment Variable memory corruption

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CVSS Meta Temp Score
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CTI Interest Score
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8.2$0-$5k0.00

A vulnerability was found in Perl up to 5.24.2/5.26.0 (Programming Language Software). It has been rated as critical. Affected by this issue is the function CPerlHost::Add of the file win32/perlhost.h. The manipulation as part of a Environment Variable leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. Impacted is confidentiality, integrity, and availability.

The bug was discovered 09/15/2017. The weakness was presented 09/28/2017 by John Leitch as confirmed git commit (GIT Repository). The advisory is available at perl5.git.perl.org. This vulnerability is handled as CVE-2017-12814 since 08/11/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 9 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 103442 (FreeBSD : perl -- multiple vulnerabilities (d9e82328-a129-11e7-987e-4f174049b30a)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context local.

Upgrading to version 5.24.3-RC1 or 5.26.1-RC1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at perl5.git.perl.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 101051) and Tenable (103442).

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CPE 2.3infoedit

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VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

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Exploitinginfoedit

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 103442
Nessus Name: FreeBSD : perl -- multiple vulnerabilities (d9e82328-a129-11e7-987e-4f174049b30a)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfoedit

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Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: Perl 5.24.3-RC1/5.26.1-RC1
Patch: perl5.git.perl.org

Timelineinfoedit

08/11/2017 🔍
09/15/2017 +35 days 🔍
09/24/2017 +9 days 🔍
09/25/2017 +1 days 🔍
09/27/2017 +2 days 🔍
09/28/2017 +1 days 🔍
09/28/2017 +0 days 🔍
09/28/2017 +0 days 🔍
01/14/2021 +1204 days 🔍

Sourcesinfoedit

Advisory: perl5.git.perl.org
Researcher: John Leitch
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12814 (🔍)
SecurityFocus: 101051 - Perl CVE-2017-12814 Stack Based Buffer Overflow Vulnerability

Entryinfoedit

Created: 09/28/2017 11:11 AM
Updated: 01/14/2021 03:36 PM
Changes: (2) advisory_person_name vulnerability_cvss2_nvd_basescore
Complete: 🔍

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