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Product Affected

This issue affects Junos OS 20.4, 21.1, 21.2, 21.3, 21.4, 22.1, 22.2. Affected platforms: MX Series, SRX Series.

Severity

High

Severity Assessment (CVSS) Score

7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Problem

A Buffer Overflow vulnerability in SIP ALG of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).

On all MX Series and SRX Series platform with SIP ALG enabled, when a malformed SIP packet is received, the flow processing daemon (flowd) will crash and restart.

This issue affects:

Juniper Networks Junos OS on MX Series and SRX Series

20.4 versions prior to 20.4R3-S5;
21.1 versions prior to 21.1R3-S4;
21.2 versions prior to 21.2R3-S2;
21.3 versions prior to 21.3R3-S1;
21.4 versions prior to 21.4R3;
22.1 versions prior to 22.1R1-S2, 22.1R2;
22.2 versions prior to 22.2R1-S1, 22.2R2.

This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1 on MX Series and SRX Series.

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-2023-22416.

Solution

The following software releases have been updated to resolve this specific issue: 20.4R3-S5, 21.1R3-S4, 21.2R3-S2, 21.3R3-S1, 21.4R3, 22.1R1-S2, 22.1R2, 22.2R1-S1, 22.2R2, 22.3R1, and all subsequent releases.

This issue is being tracked as 1668830.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround

There are no known workarounds for this issue, but it should be considered to disable the SIP ALG if it's not strictly needed.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History