CVE-2021-31367: Junos OS: PTX Series: An FPC heap memory leak will be triggered by certain Flowspec route operations which can lead to an FPC crash
First published: Wed Oct 13 2021(Updated: )
A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on PTX Series allows an adjacent attacker to cause a Denial of Service (DoS) by sending genuine BGP flowspec packets which cause an FPC heap memory leak. Once having run out of memory the FPC will crash and restart along with a core dump. Continued receipted of these packets will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R3-S6; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos Evolved is not affected.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Junos OS Evolved | =18.4 | |
| Junos OS Evolved | =18.4-r1 | |
| Junos OS Evolved | =18.4-r1-s1 | |
| Junos OS Evolved | =18.4-r1-s2 | |
| Junos OS Evolved | =18.4-r1-s3 | |
| Junos OS Evolved | =18.4-r1-s4 | |
| Junos OS Evolved | =18.4-r1-s5 | |
| Junos OS Evolved | =18.4-r1-s6 | |
| Junos OS Evolved | =18.4-r1-s7 | |
| Junos OS Evolved | =18.4-r2 | |
| Junos OS Evolved | =18.4-r2-s1 | |
| Junos OS Evolved | =18.4-r2-s2 | |
| Junos OS Evolved | =18.4-r2-s3 | |
| Junos OS Evolved | =18.4-r2-s4 | |
| Junos OS Evolved | =18.4-r2-s5 | |
| Junos OS Evolved | =18.4-r2-s6 | |
| Junos OS Evolved | =18.4-r2-s7 | |
| Junos OS Evolved | =18.4-r2-s8 | |
| Junos OS Evolved | =18.4-r3 | |
| Junos OS Evolved | =18.4-r3-s1 | |
| Junos OS Evolved | =18.4-r3-s2 | |
| Junos OS Evolved | =18.4-r3-s3 | |
| Junos OS Evolved | =18.4-r3-s4 | |
| Junos OS Evolved | =18.4-r3-s5 | |
| Junos OS Evolved | =18.4-r3-s6 | |
| Junos OS Evolved | =18.4-r3-s7 | |
| Junos OS Evolved | =18.4-r3-s8 | |
| Junos OS Evolved | =19.1 | |
| Junos OS Evolved | =19.1-r1 | |
| Junos OS Evolved | =19.1-r1-s1 | |
| Junos OS Evolved | =19.1-r1-s2 | |
| Junos OS Evolved | =19.1-r1-s3 | |
| Junos OS Evolved | =19.1-r1-s4 | |
| Junos OS Evolved | =19.1-r1-s5 | |
| Junos OS Evolved | =19.1-r1-s6 | |
| Junos OS Evolved | =19.1-r2 | |
| Junos OS Evolved | =19.1-r2-s1 | |
| Junos OS Evolved | =19.1-r2-s2 | |
| Junos OS Evolved | =19.1-r3 | |
| Junos OS Evolved | =19.1-r3-s1 | |
| Junos OS Evolved | =19.1-r3-s2 | |
| Junos OS Evolved | =19.1-r3-s3 | |
| Junos OS Evolved | =19.1-r3-s4 | |
| Junos OS Evolved | =19.1-r3-s5 | |
| Junos OS Evolved | =19.1-r3-s6 | |
| Junos OS Evolved | =19.2 | |
| Junos OS Evolved | =19.2-r1 | |
| Junos OS Evolved | =19.2-r1-s1 | |
| Junos OS Evolved | =19.2-r1-s2 | |
| Junos OS Evolved | =19.2-r1-s3 | |
| Junos OS Evolved | =19.2-r1-s4 | |
| Junos OS Evolved | =19.2-r1-s5 | |
| Junos OS Evolved | =19.2-r1-s6 | |
| Junos OS Evolved | =19.2-r2 | |
| Junos OS Evolved | =19.2-r2-s1 | |
| Junos OS Evolved | =19.2-r3 | |
| Junos OS Evolved | =19.2-r3-s1 | |
| Junos OS Evolved | =19.2-r3-s2 | |
| Junos OS Evolved | =19.3 | |
| Junos OS Evolved | =19.3-r1 | |
| Junos OS Evolved | =19.3-r1-s1 | |
| Junos OS Evolved | =19.3-r2 | |
| Junos OS Evolved | =19.3-r2-s1 | |
| Junos OS Evolved | =19.3-r2-s2 | |
| Junos OS Evolved | =19.3-r2-s3 | |
| Junos OS Evolved | =19.3-r2-s4 | |
| Junos OS Evolved | =19.3-r2-s5 | |
| Junos OS Evolved | =19.3-r3 | |
| Junos OS Evolved | =19.3-r3-s1 | |
| Junos OS Evolved | =19.3-r3-s2 | |
| Junos OS Evolved | =19.4-r1 | |
| Junos OS Evolved | =19.4-r1-s1 | |
| Junos OS Evolved | =19.4-r1-s2 | |
| Junos OS Evolved | =19.4-r1-s3 | |
| Junos OS Evolved | =19.4-r3 | |
| Junos OS Evolved | =19.4-r3-s1 | |
| Junos OS Evolved | =19.4-r3-s2 | |
| Junos OS Evolved | =19.4-r3-s3 | |
| Junos OS Evolved | =19.4-r3-s4 | |
| Junos OS Evolved | =19.4-r3-s5 | |
| Junos OS Evolved | =20.1-r1 | |
| Junos OS Evolved | =20.1-r1-s1 | |
| Junos OS Evolved | =20.1-r1-s2 | |
| Junos OS Evolved | =20.1-r1-s3 | |
| Junos OS Evolved | =20.1-r1-s4 | |
| Junos OS Evolved | =20.1-r2 | |
| Junos OS Evolved | =20.1-r2-s1 | |
| Junos OS Evolved | =20.2-r1 | |
| Junos OS Evolved | =20.2-r1-s1 | |
| Junos OS Evolved | =20.2-r1-s2 | |
| Junos OS Evolved | =20.2-r1-s3 | |
| Junos OS Evolved | =20.2-r2 | |
| Junos OS Evolved | =20.2-r2-s1 | |
| Junos OS Evolved | =20.2-r2-s2 | |
| Junos OS Evolved | =20.2-r2-s3 | |
| Junos OS Evolved | =20.2-r3 | |
| Junos OS Evolved | =20.3-r1 | |
| Junos OS Evolved | =20.3-r1-s1 | |
| Junos OS Evolved | =20.3-r2 | |
| Junos OS Evolved | =20.3-r2-s1 | |
| Junos OS Evolved | =20.4-r1 | |
| Junos OS Evolved | =20.4-r1-s1 | |
| Junos OS Evolved | =20.4-r2 | |
| Junos OS Evolved | =20.4-r2-s1 | |
| Junos OS Evolved | =21.1-r1 | |
| Junos OS Evolved | =21.1-r1-s1 | |
| Juniper PTX1000 | ||
| Juniper PTX10001-36MR | ||
| Juniper PTX10002 | ||
| Juniper PTX10003 80C | ||
| Juniper PTX10004 | ||
| Juniper PTX10008 | ||
| Juniper PTX10016 | ||
| Juniper PTX3000 | ||
| Juniper PTX Series |
Remedy
The following software releases have been updated to resolve this specific issue in Junos OS: 18.4R3-S9, 19.1R3-S7, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R1-S4, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R3, 21.1R2, 21.2R1, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-31367?
CVE-2021-31367 has been rated as a high-severity vulnerability due to its potential to cause Denial of Service (DoS) conditions.
How do I fix CVE-2021-31367?
To fix CVE-2021-31367, upgrade your Junos OS to the specified non-vulnerable versions as indicated in the vendor's advisory.
What systems are affected by CVE-2021-31367?
CVE-2021-31367 affects multiple versions of Juniper Networks Junos OS, specifically on PTX Series devices.
Can CVE-2021-31367 be exploited remotely?
Yes, CVE-2021-31367 can be exploited remotely by an adjacent attacker sending malicious BGP flowspec packets.
What are the symptoms of CVE-2021-31367 being exploited?
Exploitation of CVE-2021-31367 can lead to increased memory usage and potential Denial of Service on affected devices.
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