Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables
CVE-2023-36844

5.3MEDIUM

Key Information:

Vendor
Juniper Networks
Status
Junos OS
Vendor
CVE Published:
17 August 2023

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 38%🦅 CISA Reported📰 News Worthy

Summary

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables.

Using a crafted request an attacker is able to modify

certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX 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 22.3R3-S1;

  • 22.4 versions

prior to

22.4R2-S2, 22.4R3;

  • 23.2 versions prior to

23.2R1-S1, 23.2R2.

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected Version(s)

Junos OS EX Series 0 < 20.4R3-S9

Junos OS EX Series 21.1 < 21.1*

Junos OS EX Series 21.2 < 21.2R3-S6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

juniper-rce_cve-2023-36844
Created by watchtowrlabs

CVE-2023-36844_Juniper_RCE
Created by r3dcl1ff

CVE-2023-36844
Created by ThatNotEasy

News Articles

favicon imageThe Hacker News

New Juniper Junos OS Flaws Expose Devices to Remote Attacks - Patch Now

JuniperNetworks released an "out-of-cycle" security patch for Junos OS. Attackers could remotely execute code by chaining these vulnerabilities.

1 year ago

References

https://supportportal.juniper.net/JSA72300
vendor-advisorymitigation
http://packetstormsecurity.com/files/174865/Juniper-SRX-F...

EPSS Score

38% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • 📰

    First article discovered by The Hacker News

  • Vulnerability published

  • Vulnerability Reserved

Collectors

NVD DatabaseMitre DatabaseCISA Database3 Proof of Concept(s)1 News Article(s)

Credit

LYS, working with DEVCORE Internship Program
.