2023-01 Security Bulletin: Junos OS: SRX Series: The flowd daemon will crash when Unified Policies are used with IPv6 and certain dynamic applications are rejected by the device (CVE-2023-22411)

Product Affected

This issue affects Junos OS 19.2, 19.3, 19.4, 20.2, 20.3, 20.4, 21.1, 21.2, 21.3, 21.4. Affected platforms: 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

An Out-of-Bounds Write vulnerability in Flow Processing Daemon (flowd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause Denial of Service (DoS).

On SRX Series devices using Unified Policies with IPv6, when a specific IPv6 packet goes through a dynamic-application filter which will generate an ICMP deny message, the flowd core is observed and the PFE is restarted.

This issue affects:

Juniper Networks Junos OS on SRX Series:

19.2 versions prior to 19.2R3-S6;
19.3 versions prior to 19.3R3-S6;
19.4 versions prior to 19.4R3-S9;
20.2 versions prior to 20.2R3-S5;
20.3 versions prior to 20.3R3-S4;
20.4 versions prior to 20.4R3-S3;
21.1 versions prior to 21.1R3;
21.2 versions prior to 21.2R3;
21.3 versions prior to 21.3R2;
21.4 versions prior to 21.4R2.

Security policy with dynamic-application Junos:QUIC (or similar applications) need to be configured for this issue to be present.

[set security zones security-zone trust]
[set security zones security-zone untrust]
[set security policies from-zone trust to-zone untrust policy p3 match source-address any]
[set security policies from-zone trust to-zone untrust policy p3 match destination-address any]
[set security policies from-zone trust to-zone untrust policy p3 match dynamic-application junos:QUIC]
[set security policies from-zone trust to-zone untrust policy p3 then permit]

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-2023-22411.

Solution

The following software releases have been updated to resolve this specific issue: 19.2R3-S6, 19.3R3-S6, 19.4R3-S9, 20.2R3-S5, 20.3R3-S4, 20.4R3-S3, 21.1R3, 21.2R3, 21.3R2, 21.4R2, 22.1R1, and all subsequent releases.

This issue is being tracked as 1601806.

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.

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