Juniper Networks Junos OS let Attacker Remotely Execute Code

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.

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).

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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