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CVE-2023-36834— Junos OS: SRX 4600 and SRX 5000 Series: The receipt of specific genuine packets by SRXes configured for L2 transparency will cause a DoS

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 SRX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 SRX存在安全漏洞，该漏洞源于数据包转发引擎(PFE)中存在不完全内部状态区分漏洞，攻击者可利用该漏洞造成拒绝服务（DoS）。受影响的产品和版本：Juniper Networks Junos OS 20.1R1及更高版本；20.2R3-S7之前的20

CVSS 6.5 · Medium EPSS 0.30% · P23

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-36834

Vulnerability Information
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Vulnerability Title
Junos OS: SRX 4600 and SRX 5000 Series: The receipt of specific genuine packets by SRXes configured for L2 transparency will cause a DoS
Source: CVE Program / CVE List V5
Vulnerability Description
An Incomplete Internal State Distinction vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX 4600 and SRX 5000 Series allows an adjacent attacker to cause a Denial of Service (DoS). If an SRX is configured in L2 transparent mode the receipt of a specific genuine packet can cause a single Packet Processing Engines (PPE) component of the PFE to run into a loop, which in turn will render the PPE unavailable. Each packet will cause one PPE to get into a loop, leading to a gradual performance degradation until all PPEs are unavailable and all traffic processing stops. To recover the affected FPC need to be restarted. This issue affects Juniper Networks Junos OS on SRX 4600 and SRX 5000 Series: 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S7; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3-S7; 21.1 versions prior to 21.1R3-S5; 21.2 versions prior to 21.2R3-S3; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3-S1; 22.1 versions prior to 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R1-S1, 22.3R2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的内部状态区分
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS SRX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS SRX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 SRX存在安全漏洞，该漏洞源于数据包转发引擎(PFE)中存在不完全内部状态区分漏洞，攻击者可利用该漏洞造成拒绝服务（DoS）。受影响的产品和版本：Juniper Networks Junos OS 20.1R1及更高版本；20.2R3-S7之前的20
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 20.1 ~ 20.1* -

II. Public POCs for CVE-2023-36834

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III. Intelligence Information for CVE-2023-36834

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Other References for CVE-2023-36834 (1)

Same Patch Batch · Juniper Networks · 2023-07-14 · 12 CVEs total

CVE-2023-36835 7.5 HIGH Junos OS: QFX10000 Series: All traffic will be dropped after a specific valid IP packet ha
CVE-2023-28985 7.5 HIGH SRX Series and MX Series: An FPC core is observed when IDP is enabled on the device and a
CVE-2023-36832 7.5 HIGH Junos OS: MX Series: PFE crash upon receipt of specific packet destined to an AMS interfac
CVE-2023-36831 7.5 HIGH Junos OS: SRX Series: jbuf memory leak when SSL Proxy and UTM Web-Filtering is applied
CVE-2023-36850 6.5 MEDIUM Junos OS: MX Series: An MPC will crash upon receipt of a malformed CFM packet.
CVE-2023-36849 6.5 MEDIUM Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is receiv
CVE-2023-36848 6.5 MEDIUM Junos OS: MX Series: The FPC will crash on receiving a malformed CFM packet
CVE-2023-36833 6.5 MEDIUM Junos OS Evolved: PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202: The af
CVE-2023-36840 5.5 MEDIUM Junos OS and Junos OS Evolved: An rpd crash occurs when a specific L2VPN command is run
CVE-2023-36838 5.5 MEDIUM Junos OS: SRX Series: A flowd core occurs when running a low privileged CLI command
CVE-2023-36836 4.7 MEDIUM Junos OS and Junos OS Evolved: In a MoFRR scenario an rpd core may be observed when a low

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-372

V. Comments for CVE-2023-36834

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