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CVE-2019-0048— EX4300 Series: When a firewall filter is applied to a loopback interface, other firewall filters for multicast traffic may fail

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（EX4300 Series）中存在安全漏洞。攻击者可利用该漏洞造成防火墙过滤器停止工作。以下产品及版本受到影响：Juniper Networks Junos OS 14.1X53版本，17.1版本，17.2版本，17.3版本，17.4版本，18.1版本，18

AI Predicted 5.3 Difficulty: Moderate EPSS 0.97% · P60

Possible ATT&CK Techniques 1 AI

T1571 · Non-Standard Port
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I. Basic Information for CVE-2019-0048

Vulnerability Information
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Vulnerability Title
EX4300 Series: When a firewall filter is applied to a loopback interface, other firewall filters for multicast traffic may fail
Source: CVE Program / CVE List V5
Vulnerability Description
On EX4300 Series switches with TCAM optimization enabled, incoming multicast traffic matches an implicit loopback filter rule first, since it has high priority. This rule is meant for reserved multicast addresses 224.0.0.x, but incorrectly matches on 224.x.x.x. Due to this bug, when a firewall filter is applied on the loopback interface, other firewall filters might stop working for multicast traffic. The command 'show firewall filter' can be used to confirm whether the filter is working. This issue only affects the EX4300 switch. No other products or platforms are affected by this vulnerability. This issue affects: Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D51, 14.1X53-D115 on EX4300 Series; 17.1 versions prior to 17.1R3 on EX4300 Series; 17.2 versions prior to 17.2R3-S2 on EX4300 Series; 17.3 versions prior to 17.3R3-S3 on EX4300 Series; 17.4 versions prior to 17.4R2-S5, 17.4R3 on EX4300 Series; 18.1 versions prior to 18.1R3-S1 on EX4300 Series; 18.2 versions prior to 18.2R2 on EX4300 Series; 18.3 versions prior to 18.3R2 on EX4300 Series.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS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（EX4300 Series）中存在安全漏洞。攻击者可利用该漏洞造成防火墙过滤器停止工作。以下产品及版本受到影响：Juniper Networks Junos OS 14.1X53版本，17.1版本，17.2版本，17.3版本，17.4版本，18.1版本，18
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 14.1X53 versions prior to 14.1X53-D51 and 14.1X53-D115 on EX4300 Series -

II. Public POCs for CVE-2019-0048

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III. Intelligence Information for CVE-2019-0048

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Vendor Advisories for CVE-2019-0048 (1)

Same Patch Batch · Juniper Networks · 2019-07-11 · 5 CVEs total

CVE-2019-0046 Junos OS: EX4300 Series: Denial of Service upon receipt of large number of specific valid
CVE-2019-0049 Junos OS: RPD process crashes when BGP peer restarts
CVE-2019-0052 SRX Series: srxpfe process crash while JSF/UTM module parses specific HTTP packets
CVE-2019-0053 Junos OS: Insufficient validation of environment variables in telnet client may lead to st

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-200

V. Comments for CVE-2019-0048

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