PT-2023-6520 · Juniper Networks · Junos

Published 2023-09-05 · Updated 2025-10-24 · CVE-2023-36851

Positive Technologies (AI Summary)

CVSS v2.0

10

High

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Juniper Junos OS SRX Series versions 21.2 prior to 21.2R3-S8 Juniper Junos OS SRX Series versions 21.4 prior to 21.4R3-S6 Juniper Junos OS SRX Series versions 22.1 prior to 22.1R3-S5 Juniper Junos OS SRX Series versions 22.2 prior to 22.2R3-S3 Juniper Junos OS SRX Series versions 22.3 prior to 22.3R3-S2 Juniper Junos OS SRX Series versions 22.4 prior to 22.4R2-S2, 22.4R3 Juniper Junos OS SRX Series versions 23.2 prior to 23.2R1-S2, 23.2R2

Description A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to "webauth operation.php" that doesn't require authentication, an attacker is able to upload and download arbitrary files via J-Web, leading to a loss of integrity or confidentiality, which may allow chaining to other vulnerabilities. About 79 percent of public-facing Juniper SRX firewalls remain vulnerable to this security flaw, which can allow an unauthenticated attacker to remotely execute code on the devices.

Recommendations For versions 21.2 prior to 21.2R3-S8, update to version 21.2R3-S8 or later. For versions 21.4 prior to 21.4R3-S6, update to version 21.4R3-S6 or later. For versions 22.1 prior to 22.1R3-S5, update to version 22.1R3-S5 or later. For versions 22.2 prior to 22.2R3-S3, update to version 22.2R3-S3 or later. For versions 22.3 prior to 22.3R3-S2, update to version 22.3R3-S2 or later. For versions 22.4 prior to 22.4R2-S2, 22.4R3, update to a version that is not vulnerable. For versions 23.2 prior to 23.2R1-S2, 23.2R2, update to a version that is not vulnerable. As a temporary workaround, consider restricting access to the "webauth operation.php" endpoint until a patch is available.

Fix

Missing Authentication

Weakness Enumeration

CWE-306

Related Identifiers

BDU:2023-07267

CVE-2023-36851

Affected Products

Junos

References · 18

• https://supportportal.juniper.net/s/article/2023-08-Out-of-Cycle-Security-Bulletin-Junos-OS-SRX-Series-and-EX-Series-Multiple-vulnerabilities-in-J-Web-can-be-combined-to-allow-a-preAuth-Remote-Code-Execution?language=en_US · Security Note
• https://supportportal.juniper.net/JSA72300 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-36851 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-36851 · Security Note
• https://bdu.fstec.ru/vul/2023-07267 · Security Note
• https://twitter.com/JuniperSIRT/status/1706771023000166663 · Twitter Post
• https://twitter.com/JuniperSIRT/status/1750657009417179181 · Twitter Post
• https://twitter.com/CVEnew/status/1706764614824787971 · Twitter Post
• https://twitter.com/JuniperSIRT/status/1722340106252755186 · Twitter Post
• https://twitter.com/inthewildio/status/1724369148065591706 · Twitter Post
• https://twitter.com/JuniperSIRT/status/1699148810138837228 · Twitter Post
• https://twitter.com/wvuuuuuuuuuuuuu/status/1699594723172765800 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1703918890143662275 · Twitter Post
• https://cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36851 · Note
• https://t.me/cvenotify/84566 · Telegram Post