PHP 5.6.x/7.0.7 /ext/phar/phar_object.c use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k0.00

A vulnerability was found in PHP 5.6.x/7.0.7 (Programming Language Software) and classified as critical. This issue affects an unknown function of the file /ext/phar/phar_object.c. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

/ext/phar/phar_object.c in PHP 7.0.7 and 5.6.x allows remote attackers to execute arbitrary code. NOTE: Introduced as part of an incomplete fix to CVE-2015-6833.

The bug was discovered 06/17/2016. The weakness was disclosed 06/08/2017 (Website). The advisory is shared at rhn.redhat.com. The identification of this vulnerability is CVE-2016-4473 since 05/02/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 93 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 93568 (Debian DLA-628-1 : php5 security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169236 (SUSE Enterprise Linux Security Update for php7 (SUSE-SU-2016:2460-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (93568).

Productinfo

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Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

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

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 93568
Nessus Name: Debian DLA-628-1 : php5 security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801364
OpenVAS Name: PHP Remote Code Execution Vulnerability-01 Jun17 (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/02/2016 🔍
06/17/2016 +46 days 🔍
09/18/2016 +93 days 🔍
09/19/2016 +1 days 🔍
06/08/2017 +262 days 🔍
06/08/2017 +0 days 🔍
06/08/2017 +0 days 🔍
06/09/2017 +1 days 🔍
12/08/2022 +2008 days 🔍

Sourcesinfo

Product: php.org

Advisory: RHSA-2016:2750
Researcher: Hans Jerry Illikainen
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-4473 (🔍)
SecurityFocus: 98999 - PHP CVE-2016-4473 Incomplete Fix Remote Code Execution Vulnerability

Entryinfo

Created: 06/09/2017 07:59
Updated: 12/08/2022 10:05
Changes: 06/09/2017 07:59 (72), 10/15/2019 12:48 (5), 12/26/2020 15:28 (2), 12/08/2022 10:05 (3)
Complete: 🔍
Cache ID: 18:1D7:103

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