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CVE-2019-1686— Cisco ASR 9000 Series Aggregation Services Routers ACL Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XR Software
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 ASR 9000是美国思科（Cisco）公司的一款9000系列聚合服务路由器。 Cisco ASR 9000中的TCP标志检查功能（用于ACLs）存在存在访问控制错误漏洞，该漏洞源于网络系统或产品未正确限制来自未授权角色的资源访问。

AI Predicted 7.4 Difficulty: Moderate EPSS 1.59% · P75
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I. Basic Information for CVE-2019-1686

Vulnerability Information
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Vulnerability Title
Cisco ASR 9000 Series Aggregation Services Routers ACL Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the TCP flags inspection feature for access control lists (ACLs) on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass protection offered by a configured ACL on an affected device. The vulnerability is due to incorrect processing of the ACL applied to an interface of an affected device when Cisco Express Forwarding load balancing using the 3-tuple hash algorithm is enabled. An attacker could exploit this vulnerability by sending traffic through an affected device that should otherwise be denied by the configured ACL. An exploit could allow the attacker to bypass protection offered by a configured ACL on the affected device. There are workarounds that address this vulnerability. Affected Cisco IOS XR versions are: Cisco IOS XR Software Release 5.1.1 and later till first fixed. First Fixed Releases: 6.5.2 and later, 6.6.1 and later.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco ASR 9000 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco ASR 9000是美国思科（Cisco）公司的一款9000系列聚合服务路由器。 Cisco ASR 9000中的TCP标志检查功能（用于ACLs）存在存在访问控制错误漏洞，该漏洞源于网络系统或产品未正确限制来自未授权角色的资源访问。
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 IOS XR Software unspecified ~ 6.5.2 -

II. Public POCs for CVE-2019-1686

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III. Intelligence Information for CVE-2019-1686

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Vendor Advisories for CVE-2019-1686 (2)

Same Patch Batch · Cisco · 2019-04-17 · 8 CVEs total

CVE-2018-0248 Cisco Wireless LAN Controller Software GUI Configuration Denial of Service Vulnerabilities
CVE-2018-0382 Cisco Wireless LAN Controller Software Session Hijacking Vulnerability
CVE-2019-1654 Cisco Aironet Series Access Points Development Shell Access Vulnerability
CVE-2019-1710 Cisco IOS XR 64-Bit Software for Cisco ASR 9000 Series Aggregation Services Routers Networ
CVE-2019-1711 Cisco IOS XR gRPC Software Denial of Service Vulnerability
CVE-2019-1718 Cisco Identity Services Engine SSL Renegotiation Denial of Service Vulnerability
CVE-2019-1712 Cisco IOS XR Software Protocol Independent Multicast Denial of Service Vulnerability

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-284

V. Comments for CVE-2019-1686

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