Vulnerability Name:

CVE-2020-1617 (CCN-179288)

Assigned:2019-11-04
Published:2020-04-08
Updated:2021-02-05
Summary:This issue occurs on Juniper Networks Junos OS devices which do not support Advanced Forwarding Interface (AFI) / Advanced Forwarding Toolkit (AFT). Devices using AFI and AFT are not exploitable to this issue. An improper initialization of memory in the packet forwarding architecture in Juniper Networks Junos OS non-AFI/AFT platforms which may lead to a Denial of Service (DoS) vulnerability being exploited when a genuine packet is received and inspected by non-AFT/AFI sFlow and when the device is also configured with firewall policers. This first genuine packet received and inspected by sampled flow (sFlow) through a specific firewall policer will cause the device to reboot. After the reboot has completed, if the device receives and sFlow inspects another genuine packet seen through a specific firewall policer, the device will generate a core file and reboot. Continued inspection of these genuine packets will create an extended Denial of Service (DoS) condition. Depending on the method for service restoration, e.g. hard boot or soft reboot, a core file may or may not be generated the next time the packet is received and inspected by sFlow. This issue affects: Juniper Networks Junos OS 17.4 versions prior to 17.4R2-S9, 17.4R3 on PTX1000 and PTX10000 Series, QFX10000 Series; 18.1 versions prior to 18.1R3-S9 on PTX1000 and PTX10000 Series, QFX10000 Series; 18.2X75 versions prior to 18.2X75-D12, 18.2X75-D30 on PTX1000 and PTX10000 Series, QFX10000 Series; 18.2 versions prior to 18.2R3 on PTX1000 and PTX10000 Series, QFX10000 Series; 18.3 versions prior to 18.3R3 on PTX1000 and PTX10000 Series, QFX10000 Series. This issue is not applicable to Junos OS versions before 17.4R1. This issue is not applicable to Junos OS Evolved or Junos OS with Advanced Forwarding Toolkit (AFT) forwarding implementations which use a different implementation of sFlow. The following example information is unrelated to this issue and is provided solely to assist you with determining if you have AFT or not. Example: A Junos OS device which supports the use of EVPN signaled VPWS with Flexible Cross Connect uses the AFT implementation. Since this configuration requires support and use of the AFT implementation to support this configuration, the device is not vulnerable to this issue as the sFlow implementation is different using the AFT architecture. For further details about AFT visit the AFI / AFT are in the links below. If you are uncertain if you use the AFI/AFT implementation or not, there are configuration examples in the links below which you may use to determine if you are vulnerable to this issue or not. If the commands work, you are. If not, you are not. You may also use the Feature Explorer to determine if AFI/AFT is supported or not. If you are still uncertain, please contact your support resources.
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
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/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): Adjacent
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
6.1 Medium (CCN CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-665
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-1617

Source: XF
Type: UNKNOWN
juniper-cve20201617-dos(179288)

Source: MISC
Type: Third Party Advisory
https://github.com/Juniper/AFI

Source: CCN
Type: Juniper Networks Security Bulletin JSA11000
Junos OS: non-AFT architectures: A specific genuine packet inspected by sFlow will cause a reboot. A second packet received and inspected by sFlow will cause a core and reboot. (CVE-2020-1617)

Source: MISC
Type: Vendor Advisory
https://kb.juniper.net/JSA11000

Source: MISC
Type: Vendor Advisory
https://www.juniper.net/documentation/en_US/junos/topics/example/example-configuring-vpws-service-with-evpn-signaling-mechanisms.html

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos:17.4:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r1-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r1-s4:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r1-s5:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r1-s6:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r1-s7:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r2-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r1-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r2-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s4:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r2-s4:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r1:-:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s4:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r1-s5:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s5:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s6:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s7:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s6:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s7:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s8:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s8:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2x75:*:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2x75:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r1-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2x75-d10:*:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r1-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r2-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r2-s4:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r2-s5:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2:r2-s6:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r1-s5:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*
  • AND
  • cpe:/h:juniper:ptx1000:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx10000:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx10001:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx10002:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx10003:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx10008:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx10016:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx3000:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ptx5000:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx10008:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx10016:-:*:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/a:juniper:junos:18.1:-:*:*:*:*:*:*
  • OR cpe:/a:juniper:junos:18.2:*:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.2x75:*:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.3:-:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    BACK
    juniper junos 17.4 -
    juniper junos 17.4 r1
    juniper junos 17.4 r1-s1
    juniper junos 17.4 r1-s2
    juniper junos 17.4 r1-s4
    juniper junos 17.4 r1-s5
    juniper junos 17.4 r1-s6
    juniper junos 17.4 r1-s7
    juniper junos 17.4 r2
    juniper junos 17.4 r2-s1
    juniper junos 17.4 r2-s2
    juniper junos 17.4 r2-s3
    juniper junos 18.1 r3
    juniper junos 18.1 r2
    juniper junos 18.2 -
    juniper junos 18.2 r2-s1
    juniper junos 18.2 r2-s2
    juniper junos 18.2 r1-s3
    juniper junos 18.1 r2-s2
    juniper junos 18.1 r3-s4
    juniper junos 18.1 r3-s3
    juniper junos 18.1 r3-s2
    juniper junos 18.1 -
    juniper junos 18.1 r2-s1
    juniper junos 18.1 r2-s4
    juniper junos 18.1 r3-s1
    juniper junos 18.2 r1
    juniper junos 17.4 r2-s4
    juniper junos 18.2 r1-s5
    juniper junos 17.4 r2-s5
    juniper junos 17.4 r2-s6
    juniper junos 17.4 r2-s7
    juniper junos 18.1 r3-s6
    juniper junos 18.1 r3-s7
    juniper junos 17.4 r2-s8
    juniper junos 18.1 r3-s8
    juniper junos 18.2x75
    juniper junos 18.3 r1-s1
    juniper junos 18.3 r2
    juniper junos 18.3 r1
    juniper junos 18.2x75 -
    juniper junos 18.3 r1-s2
    juniper junos 18.3 -
    juniper junos 18.2x75-d10
    juniper junos 18.3 r1-s3
    juniper junos 18.2 r2-s3
    juniper junos 18.2 r2-s4
    juniper junos 18.2 r2-s5
    juniper junos 18.2 r2-s6
    juniper junos 18.3 r1-s5
    juniper junos 18.3 r2-s1
    juniper junos 18.3 r2-s2
    juniper ptx1000 -
    juniper ptx10000 -
    juniper ptx10001 -
    juniper ptx10002 -
    juniper ptx10003 -
    juniper ptx10008 -
    juniper ptx10016 -
    juniper ptx3000 -
    juniper ptx5000 -
    juniper qfx10008 -
    juniper qfx10016 -
    juniper junos 18.1 -
    juniper junos 18.2
    juniper junos 17.4 -
    juniper junos 18.2x75
    juniper junos 18.3 -