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2021-10 Security Bulletin: Junos OS and Junos OS Evolved: In Point to MultiPoint (P2MP) scenarios receipt of various crafted packets causes RPD to core. (CVE-2021-31383)

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Article ID: JSA11251 SECURITY_ADVISORIES Last Updated: 13 Oct 2021Version: 1.0
Product Affected:
This issue affects Junos OS 19.2, 19.3, 19.4, 20.1, 20.2, 20.3. This issue affects Junos OS Evolved 20.1, 20.2, 20.3.
Problem:

In Point to MultiPoint (P2MP) scenarios within established sessions between network or adjacent neighbors the improper use of a source to destination copy write operation combined with a Stack-based Buffer Overflow on certain specific packets processed by the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved sent by a remote unauthenticated network attacker causes the RPD to crash causing a Denial of Service (DoS).

Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition.

This issue affects:

Juniper Networks Junos OS

  • 19.2 versions prior to 19.2R3-S2;
  • 19.3 versions prior to 19.3R2-S6, 19.3R3-S2;
  • 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3;
  • 20.1 versions prior to 20.1R2-S2, 20.1R3;
  • 20.2 versions prior to 20.2R2-S3, 20.2R3;
  • 20.3 versions prior to 20.3R2.

This issue does not affect Juniper Networks Junos OS versions prior to 19.2R1.

Juniper Networks Junos OS Evolved

  • 20.1 versions prior to 20.1R3-EVO;
  • 20.2 versions prior to 20.2R3-EVO;

20.3 versions prior to 20.3R2-EVO.

The following configuration is required for Junos OS:

[protocols ldp p2mp]
[protocols ldp interface "interface"]
[protocols ldp traffic-statistics {sensor-based-stats;}]

The following configuration is required for Junos OS Evolved:

[configuration protocols ldp p2mp]
[configuration protocols ldp interface "interface"]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2021-31383.

Solution:

The following software releases have been updated to resolve this specific issue:

Junos OS: 19.2R3-S2, 19.3R2-S6, 19.3R3-S2, 19.4R1-S4, 19.4R2-S4, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases.

Junos OS Evolved: 20.1R3-EVO, 20.2R3-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1558672.

Workaround:

For Junos OS you can remove the traffic-statistics from the configuration to work around this issue.

[protoccols ldp traffic-statistics {sensor-based-stats;}]

For Junos OS Evolved 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:
2021-10-13: 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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