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CVE-2024-39562— Junos OS Evolved: A high rate of SSH connections causes a Denial of Service

Quick assessment

Affected
Juniper Networks Junos OS Evolved
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 Evolved是美国瞻博网络（Juniper Networks）公司的Junos OS 的升级版系统。 Juniper Networks Junos OS Evolved存在安全漏洞，该漏洞源于允许攻击者通过阻止合法用户的SSH访问来导致拒绝服务(DoS)。

CVSS 7.5 · High EPSS 0.43% · P35
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I. Basic Information for CVE-2024-39562

Vulnerability Information
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Vulnerability Title
Junos OS Evolved: A high rate of SSH connections causes a Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
A Missing Release of Resource after Effective Lifetime vulnerability the xinetd process, responsible for spawning SSH daemon (sshd) instances, of Juniper Networks Junos OS Evolved allows an unauthenticated network-based attacker to cause a Denial of Service (DoS) by blocking SSH access for legitimate users. Continued receipt of these connections will create a sustained Denial of Service (DoS) condition. The issue is triggered when a high rate of concurrent SSH requests are received and terminated in a specific way, causing xinetd to crash, and leaving defunct sshd processes. Successful exploitation of this vulnerability blocks both SSH access as well as services which rely upon SSH, such as SFTP, and Netconf over SSH. Once the system is in this state, legitimate users will be unable to SSH to the device until service is manually restored.  See WORKAROUND section below. Administrators can monitor an increase in defunct sshd processes by utilizing the CLI command:   > show system processes | match sshd   root   25219 30901 0 Jul16 ?       00:00:00 [sshd] <defunct> This issue affects Juniper Networks Junos OS Evolved: * All versions prior to 21.4R3-S7-EVO * 22.3-EVO versions prior to 22.3R2-S2-EVO, 22.3R3-S2-EVO; * 22.4-EVO versions prior to 22.4R3-EVO; * 23.2-EVO versions prior to 23.2R2-EVO. This issue does not affect Juniper Networks Junos OS Evolved 22.1-EVO nor 22.2-EVO.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS Evolved 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS Evolved是美国瞻博网络（Juniper Networks）公司的Junos OS 的升级版系统。 Juniper Networks Junos OS Evolved存在安全漏洞，该漏洞源于允许攻击者通过阻止合法用户的SSH访问来导致拒绝服务(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 Evolved 0 ~ 21.4R3-S7-EVO -

II. Public POCs for CVE-2024-39562

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III. Intelligence Information for CVE-2024-39562

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Vendor Advisories for CVE-2024-39562 (1)

Other References for CVE-2024-39562 (1)

Same Patch Batch · Juniper Networks · 2024-07-10 · 15 CVEs total

CVE-2024-39518 7.5 HIGH Junos OS: MX240, MX480, MX960 platforms using MPC10E: Memory leak will be observed when su
CVE-2024-39555 7.5 HIGH Junos OS and Junos OS Evolved: Receipt of a specific malformed BGP update causes the sessi
CVE-2024-39512 6.6 MEDIUM Junos OS Evolved: User is not logged out when the console cable is disconnected
CVE-2024-39517 6.5 MEDIUM Junos OS and Junos OS Evolved: Upon processing specific L2 traffic, rpd can hang in device
CVE-2024-39514 6.5 MEDIUM Junos OS and Junos OS Evolved: Receiving specific traffic on devices with EVPN-VPWS with I
CVE-2024-39560 6.5 MEDIUM Junos OS and Junos OS Evolved: Memory leak due to RSVP neighbor persistent error leading t
CVE-2024-39558 6.5 MEDIUM Junos OS and Junos OS Evolved: Receipt of specific PIM packet causes rpd crash when PIM is
CVE-2024-39557 6.5 MEDIUM Junos OS Evolved: MAC table changes cause a memory leak
CVE-2024-39556 6.4 MEDIUM Junos OS and Junos OS Evolved: Loading a malicious certificate from the CLI may result in
CVE-2024-39559 5.9 MEDIUM Junos OS Evolved: Receipt of a specific TCP packet may result in a system crash (vmcore) o
CVE-2024-39554 5.9 MEDIUM Junos OS and Junos OS Evolved: BGP multipath incremental calculation is resulting in an rp
CVE-2024-39561 5.8 MEDIUM Junos OS: SRX4600, SRX5000 Series: TCP packets with SYN/FIN or SYN/RST are transferred aft
CVE-2024-39513 5.5 MEDIUM Junos OS Evolved: Execution of a specific CLI command will cause a crash in the AFT manage
CVE-2024-39511 5.5 MEDIUM Junos OS: The 802.1X Authentication Daemon crashes on running a specific command

IV. Related Vulnerabilities

Same product: Junos OS Evolved
Same vendor: Juniper Networks
Same weakness: CWE-772

V. Comments for CVE-2024-39562

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