high
7.5
CWE
703
Advisory Published
Updated

CVE-2023-36831: Junos OS: SRX Series: jbuf memory leak when SSL Proxy and UTM Web-Filtering is applied

First published: Fri Jul 14 2023(Updated: )

An Improper Check or Handling of Exceptional Conditions vulnerability in the UTM (Unified Threat Management) Web-Filtering feature of Juniper Networks Junos OS on SRX Series causes a jbuf memory leak to occur when accessing certain websites, eventually leading to a Denial of Service (DoS) condition. Service restoration is only possible by rebooting the system. The jbuf memory leak only occurs in SSL Proxy and UTM Web-Filtering configurations. Other products, platforms, and configurations are not affected by this vulnerability. This issue affects Juniper Networks Junos OS on SRX Series: 22.2 versions prior to 22.2R3; 22.3 versions prior to 22.3R2-S1, 22.3R3; 22.4 versions prior to 22.4R1-S2, 22.4R2. This issue does not affect Juniper Networks Junos OS versions prior to 22.2R2.

Credit: sirt@juniper.net sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Juniper JUNOS=22.2-r1
Juniper JUNOS=22.2-r1-s1
Juniper JUNOS=22.2-r1-s2
Juniper JUNOS=22.2-r2
Juniper JUNOS=22.2-r2-s1
Juniper JUNOS=22.2-r2-s2
Juniper JUNOS=22.3-r1
Juniper JUNOS=22.3-r1-s1
Juniper JUNOS=22.3-r1-s2
Juniper JUNOS=22.3-r2
Juniper JUNOS=22.4-r1
Juniper JUNOS=22.4-r1-s1
Juniper vSRX
Juniper Csrx
Juniper Srx100
Juniper Srx110
Juniper Srx1400
Juniper Srx1500
Juniper Srx210
Juniper Srx220
Juniper Srx240
Juniper Srx240h2
Juniper Srx240m
Juniper Srx300
Juniper Srx320
Juniper Srx340
Juniper Srx3400
Juniper Srx345
Juniper Srx3600
Juniper Srx380
Juniper Srx4000
Juniper Srx4100
Juniper Srx4200
Juniper Srx4600
Juniper Srx5000
Juniper Srx5400
Juniper Srx550
Juniper Srx550 Hm
Juniper Srx550m
Juniper Srx5600
Juniper Srx5800
Juniper Srx650

Remedy

The following software releases have been updated to resolve this specific issue: Junos OS 22.2R3, 22.3R2-S1, 22.3R3, 22.4R1-S2, 22.4R2, 23.1R1, and all subsequent releases.

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Reference Links

Frequently Asked Questions

  • What is CVE-2023-36831?

    CVE-2023-36831 is an Improper Check or Handling of Exceptional Conditions vulnerability in the UTM (Unified Threat Management) Web-Filtering feature of Juniper Networks Junos OS on SRX Series.

  • How does CVE-2023-36831 affect Junos OS?

    CVE-2023-36831 in Junos OS on SRX Series causes a jbuf memory leak to occur when accessing certain websites, leading to a Denial of Service (DoS) condition.

  • Which versions of Junos OS are affected by CVE-2023-36831?

    Junos OS versions 22.2-r1, 22.2-r1-s1, 22.2-r1-s2, 22.2-r2, 22.2-r2-s1, 22.2-r2-s2, 22.3-r1, 22.3-r1-s1, 22.3-r1-s2, 22.3-r2, 22.4-r1, and 22.4-r1-s1 are affected by CVE-2023-36831.

  • What is the severity of CVE-2023-36831?

    CVE-2023-36831 has a severity rating of high, with a severity value of 7.

  • How can I fix CVE-2023-36831?

    To fix CVE-2023-36831, it is recommended to apply the necessary updates provided by Juniper Networks. Please refer to the Juniper Networks support portal for more information.

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