title: Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to control an important environment variable
description: 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.
problem types: CWE-473 PHP External Variable Modification
affected:
{
defaultStatus: unaffected
platforms: [EX Series, SRX Series]
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S9, status: affected, version: 0, versionType: semver
lessThan: 21.1*, status: affected, version: 21.1, versionType: semver
lessThan: 21.2R3-S7, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S5, status: affected, version: 21.3, versionType: semver
lessThan: 21.4R3-S5, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R3-S4, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R3-S2, status: affected, version: 22.2, versionType: semver
lessThan: 22.3R2-S2, 22.3R3-S1, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R2-S1, 22.4R3, status: affected, version: 22.4, versionType: semver
lessThan: 23.2R1-S1, 23.2R2, status: affected, version: 23,2, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.8
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL
exploits:
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue:
20.4R3-S9*, 21.2R3-S7*, 21.3R3-S5, 21.4R3-S5*, 22.1R3-S4*, 22.2R3-S2, 22.3R2-S2, 22.3R3-S1*, 22.4R2-S1, 22.4R3*, 23.2R1-S1, 23.2R2*, 23.4R1*, and all subsequent releases.
*Pending Publication
workarounds:
Disable J-Web, or limit access to only trusted hosts.