CVE-2021-31383

Summary

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.

Affected Software

Weaknesses

• improper usage of a source to destination copy write operation
• Denial of Service (DoS)
• CWE-121: CWE-121 Stack-based Buffer Overflow

Workarounds

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.

ADP Enrichment

CVE Program Container

Additional References

• https://kb.juniper.net/JSA11251

References

• https://kb.juniper.net/JSA11251

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