Junos OS: Denial of Service vulnerability in MS-PIC, MS-MIC, MS-MPC, MS-DPC and SRX flow daemon (flowd) related to SIP ALG

A Denial of Service vulnerability in the SIP application layer gateway (ALG) component of Junos OS based platforms allows an attacker to crash MS-PIC, MS-MIC, MS-MPC, MS-DPC or SRX flow daemon (flowd) process. This issue affects Junos OS devices with NAT or stateful firewall configuration in combination with the SIP ALG enabled. SIP ALG is enabled by default on SRX Series devices except for SRX-HE devices. SRX-HE devices have SIP ALG disabled by default. The status of ALGs in SRX device can be obtained by executing the command: show security alg status Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D77; 12.3X48 versions prior to 12.3X48-D70; 15.1X49 versions prior to 15.1X49-D140; 15.1 versions prior to 15.1R4-S9, 15.1R7-S1; 15.1F6; 16.1 versions prior to 16.1R4-S9, 16.1R6-S1, 16.1R7; 16.2 versions prior to 16.2R2-S7, 16.2R3; 17.1 versions prior to 17.1R2-S7, 17.1R3; 17.2 versions prior to 17.2R1-S6, 17.2R2-S4, 17.2R3; 17.3 versions prior to 17.3R1-S5, 17.3R2-S2, 17.3R3; 17.4 versions prior to 17.4R2. No other Juniper Networks products or platforms are affected by this issue.

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Juniper Junos OS SIP application layer gateway组件安全漏洞

Juniper 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系统的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。SIP application layer gateway（ALG）是其中的一个应用层网关组件。 Juniper Junos OS中的SIP ALG组件存在拒绝服务漏洞。攻击者可利用该漏洞造成MS-PIC、MS-MIC、MS-MPC、MS-DPC或SRX flow daemon进程崩溃。以下版本受到影响：Juniper Juno

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