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CVE-2019-1836— Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Symbolic Link Path Traversal Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS Software for Nexus 9000 Series Fabric Switches ACI Mode
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.

Cisco Nexus 9000 Series Fabric Switches是美国思科（Cisco）公司的一款9000系列光纤交换机。 Cisco Nexus 9000 Series Fabric Switches（处于Application Centric Infrastructure (ACI)模式）中的system shell存在后置链接漏洞。该漏洞源于网络系统或产品未正确过滤表示非预期资源的链接或者快捷方式的文件名。攻击者可利用该漏洞访问非法的文件路径。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.44% · P36

Possible ATT&CK Techniques 2 AI

T1068.001 T1560 · Archive Collected Data
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I. Basic Information for CVE-2019-1836

Vulnerability Information
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Vulnerability Title
Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Symbolic Link Path Traversal Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the system shell for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an authenticated, local attacker to use symbolic links to overwrite system files. These system files may be sensitive and should not be overwritable by non-root users. The attacker would need valid device credentials. The vulnerability is due to incorrect symbolic link verification of directory paths when they are used in the system shell. An attacker could exploit this vulnerability by authenticating to the device and providing crafted user input to specific symbolic link CLI commands. Successful exploitation could allow the attacker to overwrite system files that should be restricted. This vulnerability has been fixed in software version 14.1(1i).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Nexus 9000 Series Fabric Switches 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Nexus 9000 Series Fabric Switches是美国思科（Cisco）公司的一款9000系列光纤交换机。 Cisco Nexus 9000 Series Fabric Switches（处于Application Centric Infrastructure (ACI)模式）中的system shell存在后置链接漏洞。该漏洞源于网络系统或产品未正确过滤表示非预期资源的链接或者快捷方式的文件名。攻击者可利用该漏洞访问非法的文件路径。
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
Cisco Cisco NX-OS Software for Nexus 9000 Series Fabric Switches ACI Mode unspecified ~ 14.1(1i) -

II. Public POCs for CVE-2019-1836

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III. Intelligence Information for CVE-2019-1836

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Vendor Advisories for CVE-2019-1836 (2)

Same Patch Batch · Cisco · 2019-05-03 · 41 CVEs total

CVE-2019-1692 Cisco Application Policy Infrastructure Controller Web-Based Management Interface Usage In
CVE-2019-1703 Cisco Firepower Threat Defense Software Packet Processing Denial of Service Vulnerability
CVE-2019-1704 Cisco Firepower Threat Defense Software SMB Protocol Preprocessor Detection Engine Denial
CVE-2019-1699 Cisco Firepower Threat Defense Software Command Injection Vulnerability
CVE-2019-1697 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Lightweig
CVE-2019-1694 Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software TCP
CVE-2019-1695 Cisco Adaptive Security Appliance and Firepower Threat Defense Software Layer 2 Filtering
CVE-2019-1696 Cisco Firepower Threat Defense Software SMB Protocol Preprocessor Detection Engine Denial
CVE-2019-1693 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN De
CVE-2019-1687 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software TCP Proxy
CVE-2019-1701 Cisco Adaptive Security Appliance and Firepower Threat Defense Software WebVPN Cross-Site
CVE-2019-1635 Cisco IP Phone 7800 Series and 8800 Series Session Initiation Protocol XML Denial of Servi
CVE-2019-1682 Cisco Application Policy Infrastructure Controller Privilege Escalation Vulnerability
CVE-2019-1589 Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Unmeasured
CVE-2019-1590 Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Insecure F
CVE-2019-1592 Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Privilege
CVE-2018-15462 Cisco Firepower Threat Defense Software TCP Ingress Handler Denial of Service Vulnerabilit
CVE-2019-1586 Cisco Application Policy Infrastructure Controller Recoverable Encryption Key Vulnerabilit
CVE-2019-1587 Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Filter Que
CVE-2018-15388 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN De

Showing top 20 of 41 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco NX-OS Software for Nexus 9000 Series Fabric Switches ACI Mode
Same vendor: Cisco
Same weakness: CWE-22

V. Comments for CVE-2019-1836

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