CVE-2024-39562— Juniper Networks Junos OS Evolved 安全漏洞
一分钟漏洞结论
影响对象
Juniper Networks Junos OS Evolved
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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)。
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一、 漏洞 CVE-2024-39562 基础信息
漏洞信息
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Vulnerability Title
Junos OS Evolved: A high rate of SSH connections causes a Denial of Service
来源: 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.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
来源: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS Evolved 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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)。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Juniper Networks | Junos OS Evolved | 0 ~ 21.4R3-S7-EVO | - |
|
二、漏洞 CVE-2024-39562 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-39562 厂商安全公告 (1)
-
Common Vulnerability Scoring System Version 4.0 Calculator vendor-advisory
CVE-2024-39562 其他参考 (1)
-
https://supportportal.juniper.net/JSA75724 vendor-advisory
同批安全公告 · Juniper Networks · 2024-07-10 · 共 15 条
| CVE-2024-39518 | 7.5 HIGH | Juniper Networks Junos OS 安全漏洞 |
| CVE-2024-39555 | 7.5 HIGH | Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39512 | 6.6 MEDIUM | Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39517 | 6.5 MEDIUM | Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39514 | 6.5 MEDIUM | Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39560 | 6.5 MEDIUM | Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39558 | 6.5 MEDIUM | Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39557 | 6.5 MEDIUM | Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39556 | 6.4 MEDIUM | Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39559 | 5.9 MEDIUM | Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39554 | 5.9 MEDIUM | Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39561 | 5.8 MEDIUM | Juniper Networks Junos OS 安全漏洞 |
| CVE-2024-39513 | 5.5 MEDIUM | Juniper Networks Junos OS Evolved 安全漏洞 |
| CVE-2024-39511 | 5.5 MEDIUM | Juniper Networks Junos OS 安全漏洞 |
IV. Related Vulnerabilities
Same product: Junos OS Evolved
V. Comments for CVE-2024-39562
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