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:
This issue does not affect Juniper Networks Junos OS versions prior to 22.2R2.
The following sample configuration options highlight the features required to be affected by this issue:
set services ssl proxy profile SSL-PROXY protocol-version tls12-and-lower
set services ssl proxy profile SSL-PROXY trusted-ca all
set services ssl proxy profile SSL-PROXY root-ca ssl-proxy-ecdsa1
set security pki ca-profile SECURITY-CA-GROUP_1 ca-identity SECURITY-CA-GROUP_1
...
set security utm default-configuration web-filtering juniper-enhanced default log-and-permit
set security utm feature-profile web-filtering juniper-enhanced profile 2 category ... action block
set security utm utm-policy 1 web-filtering http-profile 2
set security policies from-zone private to-zone internet policy 1 then permit application-services ssl-proxy profile-name SSL-PROXY
set security policies from-zone private to-zone internet policy 1 then permit application-services utm-policy 1
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2023-36831.
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.
This issue is being tracked as 1709031
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
2023-07-12: Initial Publication