Multiple vulnerabilities have been discovered on Junos OS, which can be combined to execute a preAuth remote code execution vulnerability on Junos OS on SRX and EX Series. An unauthenticated network-based attacker can exploit these vulnerabilities by chaining them.
Junos OS SRX is a firewall that is used to protect remote offices, branches, campuses, or data centers by extending to every point. EX series is a high-performance access and distribution/core-layer device for enterprise branches.
Juniper Networks has released a security advisory for fixing these vulnerabilities.
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CVE-2023-36844 & CVE-2023-36845: PHP External Variable Flaw
This vulnerability allows an unauthenticated network-based attacker to control some important environment variables by utilizing a crafted request and modifying the PHP environment variable, leading to integrity loss. The severity for these vulnerabilities is given as 5.3 (Medium).
CVE-2023-36846 & CVE-2023-36847: Missing Authentication Critical Function Flaw
An unauthenticated network-based attacker can cause a limited file system integrity impact, requiring authentication to upload arbitrary files through J-Web, leading to integrity loss on some parts of the file system. The severity for these vulnerabilities is given as 5.3 (Medium)
Affected Products
| Product | Affected Version | Fixed in Version |
| Junos OS on SRX Series | All versions prior to 20.4R3-S8;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; | 20.4R3-S8, 21.2R3-S6, 21.3R3-S5*, 21.4R3-S5*, 22.1R3-S3, 22.2R3-S2*, 22.3R2-S2, 22.3R3, 22.4R2-S1, 22.4R3*, 23.2R1, and all subsequent releases. |
| Junos OS on EX Series | All versions prior to 20.4R3-S8;21.2 versions prior to 21.2R3-S6;21.3 versions prior to 21.3R3-S5;21.4 versions prior to 21.4R3-S4;22.1 versions prior to 22.1R3-S3;22.2 versions prior to 22.2R3-S1;22.3 versions prior to 22.3R2-S2, 22.3R3;22.4 versions prior to 22.4R2-S1, 22.4R3. | 20.4R3-S8, 21.2R3-S6, 21.3R3-S5*, 21.4R3-S4, 22.1R3-S3, 22.2R3-S1, 22.3R2-S2, 22.3R3, 22.4R2-S1, 22.4R3*, 23.2R1, and all subsequent releases. |
Users of these products are recommended to upgrade to the latest version as per the security advisory released by Juniper Networks in order to prevent these vulnerabilities from getting exploited.
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