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2022-01 Security Bulletin: MX Series and SRX Series: The flowd daemon will crash if the SIP ALG is enabled and specific SIP messages are processed (CVE-2022-22175)

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Article ID: JSA11281 SECURITY_ADVISORIES Last Updated: 12 Jan 2022Version: 2.0
Product Affected:
This issue affects Junos OS 20.4, 21.1, 21.2, 21.3. Affected platforms: MX Series, SRX Series.
Problem:

An Improper Locking vulnerability in the SIP ALG of Juniper Networks Junos OS on MX Series and SRX Series allows an unauthenticated networked attacker to cause a flowprocessing daemon (flowd) crash and thereby a Denial of Service (DoS). Continued receipt of these specific packets will cause a sustained Denial of Service condition.

This issue can occur in a scenario where the SIP ALG is enabled and specific SIP messages are being processed simultaneously.

This issue affects Juniper Networks Junos OS:

  • 20.4 versions prior to 20.4R3-S1;
  • 21.1 versions prior to 21.1R2-S2, 21.1R3;
  • 21.2 versions prior to 21.2R1-S2, 21.2R2;
  • 21.3 versions prior to 21.3R1-S1, 21.3R2.

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 alg 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-2022-22175.

Solution:

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

This issue is being tracked as 1604123.

Workaround:
There are no viable workarounds for this issue.
Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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