Yet Another Stars Rating <= 1.8.6 - Unauthenticated PHP Object Injection

2019-01-27 00:00

Paul Dannewitz

Strategic Overview

Status

Patched in 1.8.7

Affected PluginYASR – Yet Another Star Rating Plugin for WordPress

Affected Version<= 1.8.6

CVSS9.8Critical

CVEN/A

View all YASR – Yet Another Star Rating Plugin for WordPress vulnerabilities

Vulnerability Overview

The Yet Another Stars Rating plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 1.8.6 via deserialization of untrusted input from the unserialize() function found in the yasr-shortcode-functions.php file. This allows unauthenticated attackers to inject a PHP Object. The additional presence of a POP chain allows attackers to remotely execute arbitrary code.

Technical Analysis

REMEDIATION: Update to version 1.8.7, or a newer patched version --- IDENTIFIER: CWE-502 (Deserialization of Untrusted Data) The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/bbd1e68f-1f84-40d6-9ecd-34280c3c5099

CVSS Vector

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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