Vulnerability Name:

CVE-2021-0286 (CCN-205432)

Assigned:2020-10-27
Published:2021-07-14
Updated:2021-10-25
Summary: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.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:7.8 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-754
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-0286

Source: XF
Type: UNKNOWN
juniper-cve20210286-dos(205432)

Source: CCN
Type: Juniper Networks Security Bulletin JSA11188
Junos OS Evolved: Specially crafted packets may cause the AFT manager process to crash and restart (CVE-2021-0286)

Source: CONFIRM
Type: Vendor Advisory
https://kb.juniper.net/JSA11188

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos_os_evolved:19.2:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.2:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.4:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.4:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.2:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.3:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:juniper:junos_evolved:19.2:r1:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    juniper junos os evolved 19.2 r1
    juniper junos os evolved 19.2 r2
    juniper junos os evolved 19.3 r1
    juniper junos os evolved 19.3 r2
    juniper junos os evolved 19.4 r1
    juniper junos os evolved 19.4 r2
    juniper junos os evolved 19.4 r2-s1
    juniper junos os evolved 20.1 -
    juniper junos os evolved 20.1 r1
    juniper junos os evolved 20.1 r1-s1
    juniper junos os evolved 20.2 -
    juniper junos os evolved 20.3 -
    juniper junos os evolved 20.3 r1
    juniper junos os evolved 20.4 r1
    juniper junos os evolved 21.1 r1
    juniper junos evolved 19.2 r1