title: Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables
description: 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.
problem types: CWE-473 PHP External Variable Modification
affected:
{
defaultStatus: unaffected
platforms: EX 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-S6, 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: 22.3R3-S1, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R2-S2, 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: NONE
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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, 22.3R3-S1*, 22.4R2-S2*, 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.