CVE-2021-0286: Junos OS Evolved: Specially crafted packets may cause the AFT manager process to crash and restart
First published: Thu Jul 15 2021(Updated: )
A vulnerability in the handling of exceptional conditions in Juniper Networks Junos OS Evolved (EVO) allows an attacker to send specially crafted packets to the device, causing the Advanced Forwarding Toolkit manager (evo-aftmand-bt or evo-aftmand-zx) process to crash and restart, impacting all traffic going through the FPC, resulting in a Denial of Service (DoS). Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition. Following messages will be logged prior to the crash: Feb 2 10:14:39 fpc0 evo-aftmand-bt[16263]: [Error] Nexthop: Failed to get fwd nexthop for nexthop:32710470974358 label:1089551617 for session:18 probe:35 Feb 2 10:14:39 fpc0 evo-aftmand-bt[16263]: [Error] Nexthop: Failed to get fwd nexthop for nexthop:19241453497049 label:1089551617 for session:18 probe:37 Feb 2 10:14:39 fpc0 evo-aftmand-bt[16263]: [Error] Nexthop: Failed to get fwd nexthop for nexthop:19241453497049 label:1089551617 for session:18 probe:44 Feb 2 10:14:39 fpc0 evo-aftmand-bt[16263]: [Error] Nexthop: Failed to get fwd nexthop for nexthop:32710470974358 label:1089551617 for session:18 probe:47 Feb 2 10:14:39 fpc0 audit[16263]: ANOM_ABEND auid=4294967295 uid=0 gid=0 ses=4294967295 pid=16263 comm="EvoAftManBt-mai" exe="/usr/sbin/evo-aftmand-bt" sig=11 Feb 2 10:14:39 fpc0 kernel: audit: type=1701 audit(1612260879.272:17): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=16263 comm="EvoAftManBt-mai" exe="/usr/sbin/evo-aftmand-bt" sig=1 This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Networks Junos OS Evolved | =19.2-r1 | |
| Juniper Networks Junos OS Evolved | =19.2-r2 | |
| Juniper Networks Junos OS Evolved | =19.3-r1 | |
| Juniper Networks Junos OS Evolved | =19.3-r2 | |
| Juniper Networks Junos OS Evolved | =19.4-r1 | |
| Juniper Networks Junos OS Evolved | =19.4-r2 | |
| Juniper Networks Junos OS Evolved | =19.4-r2-s1 | |
| Juniper Networks Junos OS Evolved | =20.1 | |
| Juniper Networks Junos OS Evolved | =20.1-r1 | |
| Juniper Networks Junos OS Evolved | =20.1-r1-s1 | |
| Juniper Networks Junos OS Evolved | =20.2 | |
| Juniper Networks Junos OS Evolved | =20.3 | |
| Juniper Networks Junos OS Evolved | =20.3-r1 | |
| Juniper Networks Junos OS Evolved | =20.4-r1 | |
| Juniper Networks Junos OS Evolved | =21.1-r1 |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS Evolved 20.4R2-EVO, 21.1R2-EVO, 21.2R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-0286?
CVE-2021-0286 is classified as a critical vulnerability due to its potential to cause denial of service.
How do I fix CVE-2021-0286?
To fix CVE-2021-0286, upgrade to the latest patched version of Junos OS Evolved provided by Juniper Networks.
What devices are affected by CVE-2021-0286?
CVE-2021-0286 affects various versions of Junos OS Evolved, including 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, and 21.1.
What impact does CVE-2021-0286 have on network operations?
The impact of CVE-2021-0286 includes causing the Advanced Forwarding Toolkit manager process to crash and restart, disrupting normal network operations.
When was CVE-2021-0286 publicly disclosed?
CVE-2021-0286 was publicly disclosed in 2021 as part of Juniper's security advisory for vulnerable Junos OS Evolved versions.
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