CVE-2023-36846 is a vulnerability in Juniper Networks Junos
Published on August 17, 2023
A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to user.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series: * All versions prior to 20.4R3-S8; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.
Known Exploited Vulnerability
This Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Juniper Junos OS on SRX Series contains a missing authentication for critical function vulnerability that allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to user.php that doesn't require authentication, an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities.
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-2023-36846 is exploitable 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 have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
Missing Authentication for Critical Function
The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Products Associated with CVE-2023-36846
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Affected Versions
Juniper Networks Junos OS:- Before 20.4R3-S8 is affected.
- Version 21.1 and below 21.1* is affected.
- Version 21.2 and below 21.2R3-S6 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-S3 is affected.
- Version 22.2 and below 22.2R3-S2 is affected.
- Version 22.3 and below 22.3R2-S2, 22.3R3 is affected.
- Version 22.4 and below 22.4R2-S1, 22.4R3 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.