Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-31350— Junos OS and Junos OS Evolved: Privilege escalation vulnerability in Juniper Extension Toolkit (JET)

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS 存在安全漏洞，该漏洞源于瞻博网络 Junos OS 和 Junos OS Evolved 上的瞻博扩展工具包 (JET) API 使用 gRPC 框架中的不当权限管理漏洞，该漏洞允许基于网络的低权限身份验证攻击者以 root 身份执行操作，从而导致完成目标系

CVSS 7.5 · High EPSS 0.87% · P58

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-31350

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Junos OS and Junos OS Evolved: Privilege escalation vulnerability in Juniper Extension Toolkit (JET)
Source: CVE Program / CVE List V5
Vulnerability Description
An Improper Privilege Management vulnerability in the gRPC framework, used by the Juniper Extension Toolkit (JET) API on Juniper Networks Junos OS and Junos OS Evolved, allows a network-based, low-privileged authenticated attacker to perform operations as root, leading to complete compromise of the targeted system. The issue is caused by the JET service daemon (jsd) process authenticating the user, then passing configuration operations directly to the management daemon (mgd) process, which runs as root. This issue affects Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S8, 18.4R3-S8; 19.1 versions prior to 19.1R2-S3, 19.1R3-S5; 19.2 versions prior to 19.2R1-S7, 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2-S1, 20.3R3; 20.4 versions prior to 20.4R2. This issue does not affect Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-EVO; 21.1-EVO versions prior to 21.1R2-EVO.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS 存在安全漏洞，该漏洞源于瞻博网络 Junos OS 和 Junos OS Evolved 上的瞻博扩展工具包 (JET) API 使用 gRPC 框架中的不当权限管理漏洞，该漏洞允许基于网络的低权限身份验证攻击者以 root 身份执行操作，从而导致完成目标系
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS unspecified ~ 18.4R1 -
Juniper Networks Junos OS Evolved unspecified ~ 20.4R2-EVO -

II. Public POCs for CVE-2021-31350

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-31350

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-31350 (1)

Same Patch Batch · Juniper Networks · 2021-10-19 · 42 CVEs total

CVE-2021-31349 9.8 CRITICAL Session Smart Router: Authentication Bypass Vulnerability
CVE-2021-31385 8.8 HIGH Junos OS: J-Web: A path traversal vulnerability allows an authenticated attacker to elevat
CVE-2021-31372 8.8 HIGH Junos OS: J-Web allows a locally authenticated attacker to escalate their privileges to ro
CVE-2021-31373 8.0 HIGH Junos OS: SRX Series: Persistent XSS vulnerability in J-Web
CVE-2021-31355 8.0 HIGH Junos OS: Stored Cross-Site Scripting (XSS) vulnerability in captive portal
CVE-2021-31356 7.8 HIGH Junos OS Evolved: Multiple shell-injection vulnerabilities in EVO UI wrapper scripts
CVE-2021-31359 7.8 HIGH Junos OS and Junos OS Evolved: Local Privilege Escalation vulnerability
CVE-2021-31358 7.8 HIGH Junos OS Evolved: shell-injection vulnerabilities in evo_sftp UI wrapper script
CVE-2021-31357 7.8 HIGH Junos OS Evolved: shell-injection vulnerabilities in evo_tcpdump UI wrapper script
CVE-2021-31376 7.5 HIGH Junos OS: ACX Series: Packet Forwarding Engine manager (FXPC) process crashes when process
CVE-2021-31379 7.5 HIGH Junos OS: MX Series: MPC 7/8/9/10/11 cards with MAP-E: PFE halts when an attacker sends ma
CVE-2021-31374 7.5 HIGH Junos OS and Junos OS Evolved: RPD crash while processing a specially crafted BGP UPDATE o
CVE-2021-31353 7.5 HIGH Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update
CVE-2021-31351 7.5 HIGH Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset
CVE-2021-31383 7.5 HIGH Junos OS and Junos OS Evolved: In Point to MultiPoint (P2MP) scenarios receipt of various
CVE-2021-0299 7.5 HIGH Junos OS: Kernel crash (vmcore) upon receipt of a malformed IPv6 packet
CVE-2021-31368 7.5 HIGH Junos OS: EX2300 Series, EX3400 Series, and ACX710 might become unresponsive if the out-of
CVE-2021-0296 7.4 HIGH CTPView: HSTS not being enforced on CTPView server.
CVE-2021-31384 7.2 HIGH Junos OS: SRX Series: Under a specific device configuration an attacker can access the dev
CVE-2021-31375 7.2 HIGH Junos OS: Receipt of a specific BGP update may cause RPKI policy-checks to be bypassed

Showing top 20 of 42 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-269

V. Comments for CVE-2021-31350

No comments yet

Leave a comment