An Access of Uninitialized Pointer vulnerability in SIP Application Layer Gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).
When specific valid SIP packets are received the PFE will crash and restart.
This issue affects Juniper Networks Junos OS on SRX Series and MX Series:
This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1.
To be affected the SIP ALG needs to be enabled, either implicitly / by default or by way of configuration.
Please verify on SRX with:
user@host> show security alg status | match sip
SIP : Enabled
Please verify on MX whether the following is configured:
[services ... rule <rule-name> (term <term-name> ) from/match application/application-set <name>]
where either
a. name = junos-sip
or an application or application-set refers to SIP:
b. [applications application <name> application-protocol sip]
c. [applications application-set <name> application junos-sip]
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-2022-22236.
The following software releases have been updated to resolve this specific issue: 20.4R3-S4, 21.1R3-S2, 21.2R3-S2, 21.3R2-S2, 21.3R3, 21.4R1-S2, 21.4R2, 21.4R3, 22.1R1-S1, 22.1R2, 22.2R1, and all subsequent releases.
This issue is being tracked as PR 1650755 which is visible on the Customer Support website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).IMPLEMENTATION:
Software Releases, patches and updates are available at https://support.juniper.net/support/downloads/.