Vulnerability Name:

CVE-2021-31384 (CCN-211297)

Assigned:2021-10-13
Published:2021-10-13
Updated:2021-10-25
Summary:Due to a Missing Authorization weakness and Insufficient Granularity of Access Control in a specific device configuration, a vulnerability exists in Juniper Networks Junos OS on SRX Series whereby an attacker who attempts to access J-Web administrative interfaces can successfully do so from any device interface regardless of the web-management configuration and filter rules which may otherwise protect access to J-Web. This issue affects: Juniper Networks Junos OS SRX Series 20.4 version 20.4R1 and later versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1.
CVSS v3 Severity:10.0 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
8.7 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.2 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N)
6.3 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/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): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
6.4 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-862
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-31384

Source: XF
Type: UNKNOWN
juniper-cve202131384-sec-bypass(211297)

Source: MISC
Type: Permissions Required
https://kb.juniper.net/

Source: MISC
Type: Vendor Advisory
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11252

Source: CCN
Type: Juniper Networks Security Bulletin JSA11252
Junos OS: SRX Series: Under a specific device configuration an attacker can access the devices J-Web management services from any interface, regardless of security settings protecting the service (CVE-2021-31384)

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos:20.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.4:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:21.1:r1:*:*:*:*:*:*
  • AND
  • cpe:/h:juniper:srx1500:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx300:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx4100:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx4200:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx4600:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx5400:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx550:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx5600:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:srx5800:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:juniper:junos:20.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:21.1:r1:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    juniper junos 20.4 r1
    juniper junos 20.4 r1-s1
    juniper junos 20.4 r2
    juniper junos 21.1 r1
    juniper srx1500 -
    juniper srx300 -
    juniper srx4100 -
    juniper srx4200 -
    juniper srx4600 -
    juniper srx5400 -
    juniper srx550 -
    juniper srx5600 -
    juniper srx5800 -
    juniper junos 20.4 r1
    juniper junos 21.1 r1