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CVE-2021-31377— Junos OS: A local authenticated attacker can cause RPD to core

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存在资源管理错误漏洞，该漏洞源于Junos OS 文件系统中某个文件的关键资源权限分配不正确漏洞允许本地身份验证的攻击者导致路由进程守护程序 (RPD) 崩溃并重新启动，从而导致拒绝服务 (DoS)。

CVSS 5.5 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1546.001 · Change Default File Association
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I. Basic Information for CVE-2021-31377

Vulnerability Information
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Vulnerability Title
Junos OS: A local authenticated attacker can cause RPD to core
Source: CVE Program / CVE List V5
Vulnerability Description
An Incorrect Permission Assignment for Critical Resource vulnerability of a certain file in the filesystem of Junos OS allows a local authenticated attacker to cause routing process daemon (RPD) to crash and restart, causing a Denial of Service (DoS). Repeated actions by the attacker will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13, 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S8, 18.4R3-S7; 19.1 versions prior to 19.1R2-S3, 19.1R3-S5; 19.2 versions prior to 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-S2; 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 20.3R3; 20.4 versions prior to 20.4R1-S1, 20.4R2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 资源管理错误漏洞
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存在资源管理错误漏洞，该漏洞源于Junos OS 文件系统中某个文件的关键资源权限分配不正确漏洞允许本地身份验证的攻击者导致路由进程守护程序 (RPD) 崩溃并重新启动，从而导致拒绝服务 (DoS)。
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 15.1 ~ 15.1R7-S9 -

II. Public POCs for CVE-2021-31377

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III. Intelligence Information for CVE-2021-31377

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Vendor Advisories for CVE-2021-31377 (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-2021-31359 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-2021-31356 7.8 HIGH Junos OS Evolved: Multiple shell-injection vulnerabilities in EVO UI wrapper scripts
CVE-2021-31376 7.5 HIGH Junos OS: ACX Series: Packet Forwarding Engine manager (FXPC) process crashes when process
CVE-2021-31353 7.5 HIGH Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update
CVE-2021-31374 7.5 HIGH Junos OS and Junos OS Evolved: RPD crash while processing a specially crafted BGP UPDATE o
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-2021-31351 7.5 HIGH Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset
CVE-2021-31350 7.5 HIGH Junos OS and Junos OS Evolved: Privilege escalation vulnerability in Juniper Extension Too
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

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-732

V. Comments for CVE-2021-31377

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