PHP External Variable Modification in Junos OS J-Web (pre-21.2R3-S7)
CVE-2023-36845 Published on August 17, 2023
Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to control an important environment variable
A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series
and SRX Series
allows an unauthenticated, network-based attacker to remotely execute code.
Using a crafted request which sets the variable PHPRC an attacker is able to modify the PHP execution environment allowing the injection und execution of code.
This issue affects Juniper Networks Junos OS on EX Series
and
SRX Series:
* All versions prior to
20.4R3-S9;
* 21.1 versions 21.1R1 and later;
* 21.2 versions prior to 21.2R3-S7;
* 21.3 versions prior to 21.3R3-S5;
* 21.4 versions prior to 21.4R3-S5;
* 22.1 versions
prior to
22.1R3-S4;
* 22.2 versions
prior to
22.2R3-S2;
* 22.3 versions
prior to
22.3R2-S2, 22.3R3-S1;
* 22.4 versions
prior to
22.4R2-S1, 22.4R3;
* 23.2 versions prior to 23.2R1-S1, 23.2R2.
Known Exploited Vulnerability
This Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Juniper Junos OS on EX Series and SRX Series contains a PHP external variable modification vulnerability that allows an unauthenticated, network-based attacker to control an important environment variable. Using a crafted request, which sets the variable PHPRC, an attacker is able to modify the PHP execution environment allowing the injection und execution of code.
The following remediation steps are recommended / required by November 17, 2023: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vulnerability Analysis
CVE-2023-36845 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
PHP External Variable Modification
A PHP application does not properly protect against the modification of variables from external sources, such as query parameters or cookies. This can expose the application to numerous weaknesses that would not exist otherwise.
Products Associated with CVE-2023-36845
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Affected Versions
Juniper Networks Junos OS:- Before 20.4R3-S9 is affected.
- Version 21.1 and below 21.1* is affected.
- Version 21.2 and below 21.2R3-S7 is affected.
- Version 21.3 and below 21.3R3-S5 is affected.
- Version 21.4 and below 21.4R3-S5 is affected.
- Version 22.1 and below 22.1R3-S4 is affected.
- Version 22.2 and below 22.2R3-S2 is affected.
- Version 22.3 and below 22.3R2-S2, 22.3R3-S1 is affected.
- Version 22.4 and below 22.4R2-S1, 22.4R3 is affected.
- Version 23,2 and below 23.2R1-S1, 23.2R2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.