CVE-2021-0289 (GCVE-0-2021-0289)

Vulnerability from cvelistv5 – Published: 2021-07-15 20:01 – Updated: 2024-09-17 03:48
VLAI?
Title
Junos OS: User-defined ARP Policer isn't applied on Aggregated Ethernet (AE) interface until firewall process is restarted
Summary
When user-defined ARP Policer is configured and applied on one or more Aggregated Ethernet (AE) interface units, a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability between the Device Control Daemon (DCD) and firewall process (dfwd) daemons of Juniper Networks Junos OS allows an attacker to bypass the user-defined ARP Policer. In this particular case the User ARP policer is replaced with default ARP policer. To review the desired ARP Policers and actual state one can run the command "show interfaces <> extensive" and review the output. See further details below. An example output is: show interfaces extensive | match policer Policer: Input: __default_arp_policer__ <<< incorrect if user ARP Policer was applied on an AE interface and the default ARP Policer is displayed Policer: Input: jtac-arp-ae5.317-inet-arp <<< correct if user ARP Policer was applied on an AE interface For all platforms, except SRX Series: This issue affects Juniper Networks Junos OS: All versions 5.6R1 and all later versions prior to 18.4 versions prior to 18.4R2-S9, 18.4R3-S9 with the exception of 15.1 versions 15.1R7-S10 and later versions; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2; This issue does not affect Juniper Networks Junos OS versions prior to 5.6R1. On SRX Series this issue affects Juniper Networks Junos OS: 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.4 versions prior to 19.4R3-S4; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. This issue does not affect 18.4 versions prior to 18.4R1 on SRX Series. This issue does not affect Junos OS Evolved.
Severity ?
6.5 (Medium)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
https://kb.juniper.net/JSA11191 x_refsource_CONFIRM
Impacted products
Vendor Product Version
Juniper Networks Junos OS Unaffected: unspecified , < 5.6R1 (custom)
Affected: 5.6R1 , < 5.6* (custom)
Affected: 15.1 , < 15.1R7-S10 (custom)
Affected: 16.1R1 , < 16.1* (custom)
Affected: 16.2R1 , < 16.2* (custom)
Affected: 17.1R1 , < 17.1* (custom)
Affected: 17.2R1 , < 17.2* (custom)
Affected: 17.3R1 , < 17.3* (custom)
Affected: 17.4R1 , < 17.4* (custom)
Affected: 18.1R1 , < 18.1* (custom)
Affected: 18.2R1 , < 18.2* (custom)
Affected: 18.3R1 , < 18.3* (custom)
Affected: 18.4 , < 18.4R2-S9, 18.4R3-S9 (custom)
Affected: 19.4 , < 19.4R3-S3 (custom)
Affected: 20.1 , < 20.1R3 (custom)
Affected: 20.2 , < 20.2R3-S2 (custom)
Affected: 20.3R1 , < 20.3* (custom)
Affected: 20.4 , < 20.4R3 (custom)
Affected: 21.1 , < 21.1R2 (custom)
Create a notification for this product.
    Juniper Networks Junos OS Affected: 18.4 , < 18.4R2-S9, 18.4R3-S9 (custom)
Affected: 19.4 , < 19.4R3-S3 (custom)
Affected: 20.1 , < 20.1R3 (custom)
Unaffected: 20.2 , < 20.2R3-S2 (custom)
Affected: 20.3R1 , < 20.3* (custom)
Affected: 20.4 , < 20.4R3 (custom)
Affected: 21.1 , < 21.1R2 (custom)
Create a notification for this product.
    Juniper Networks Junos OS Evolved Unaffected: Any
Create a notification for this product.
Show details on NVD website
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          "value": "First in config CLI mode check that is there any user ARP policers configured on an ae interface:\n\n  show configuration | display set | match jtac-arp\n       set groups jtac-arp-policer interfaces ae5 unit \u003c*\u003e family inet policer arp jtac-arp  \u003c\u003c\u003c this shows user arp policer configured on all ae interfaces\n\nNext validate which ARP policer is installed by using the operational cli command:\n\n\u201cshow interfaces extensive | match policer\u201d\n  show interfaces extensive | match policer\n      Policer: Input: __default_arp_policer__   \u003c\u003c\u003c incorrect if user arp policer was applied on ae interface and default arp policer is displayed\n      Policer: Input: jtac-arp-ae5.317-inet-arp \u003c\u003c\u003c correct if user arp policer was applied on ae interface"
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          "value": "When user-defined ARP Policer is configured and applied on one or more Aggregated Ethernet (AE) interface units, a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability between the Device Control Daemon (DCD) and firewall process (dfwd) daemons of Juniper Networks Junos OS allows an attacker to bypass the user-defined ARP Policer. In this particular case the User ARP policer is replaced with default ARP policer. To review the desired ARP Policers and actual state one can run the command \"show interfaces \u003c\u003e extensive\" and review the output. See further details below. An example output is: show interfaces extensive | match policer Policer: Input: __default_arp_policer__ \u003c\u003c\u003c incorrect if user ARP Policer was applied on an AE interface and the default ARP Policer is displayed Policer: Input: jtac-arp-ae5.317-inet-arp \u003c\u003c\u003c correct if user ARP Policer was applied on an AE interface For all platforms, except SRX Series: This issue affects Juniper Networks Junos OS: All versions 5.6R1 and all later versions prior to 18.4 versions prior to 18.4R2-S9, 18.4R3-S9 with the exception of 15.1 versions 15.1R7-S10 and later versions; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2; This issue does not affect Juniper Networks Junos OS versions prior to 5.6R1. On SRX Series this issue affects Juniper Networks Junos OS: 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.4 versions prior to 19.4R3-S4; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. This issue does not affect 18.4 versions prior to 18.4R1 on SRX Series. This issue does not affect Junos OS Evolved."
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          "value": "The following software releases have been updated to resolve this specific issue: For all platforms, except SRX Series, using Junos OS 15.1R7-S10, 18.4R2-S9, 18.4R3-S9, 19.4R3-S4, 20.1R3, 20.2R3-S2, 20.4R3, 21.1R2, 21.2R1, and all subsequent releases. On SRX series using Junos OS 18.4R2-S9, 18.4R3-S9, 19.4R3-S4. 20.1R3, 20.4R3, 21.1R2, 21.2R1, and all subsequent releases."
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      "title": "Junos OS: User-defined ARP Policer isn\u0027t applied on Aggregated Ethernet (AE) interface until firewall process is restarted",
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          "value": "There is no workaround for this issue. \n\nIf affected by this issue, to recover from its impact, restart the firewall process to update the ARP Policer on the AE interface unit(s).  \nFrom the CLI issue: \n\n  cli\u003e restart firewall \n\nNote: no side effects on firewall restart shall be seen when issuing this command."
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          "TITLE": "Junos OS: User-defined ARP Policer isn\u0027t applied on Aggregated Ethernet (AE) interface until firewall process is restarted"
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            "value": "First in config CLI mode check that is there any user ARP policers configured on an ae interface:\n\n  show configuration | display set | match jtac-arp\n       set groups jtac-arp-policer interfaces ae5 unit \u003c*\u003e family inet policer arp jtac-arp  \u003c\u003c\u003c this shows user arp policer configured on all ae interfaces\n\nNext validate which ARP policer is installed by using the operational cli command:\n\n\u201cshow interfaces extensive | match policer\u201d\n  show interfaces extensive | match policer\n      Policer: Input: __default_arp_policer__   \u003c\u003c\u003c incorrect if user arp policer was applied on ae interface and default arp policer is displayed\n      Policer: Input: jtac-arp-ae5.317-inet-arp \u003c\u003c\u003c correct if user arp policer was applied on ae interface"
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              "value": "When user-defined ARP Policer is configured and applied on one or more Aggregated Ethernet (AE) interface units, a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability between the Device Control Daemon (DCD) and firewall process (dfwd) daemons of Juniper Networks Junos OS allows an attacker to bypass the user-defined ARP Policer. In this particular case the User ARP policer is replaced with default ARP policer. To review the desired ARP Policers and actual state one can run the command \"show interfaces \u003c\u003e extensive\" and review the output. See further details below. An example output is: show interfaces extensive | match policer Policer: Input: __default_arp_policer__ \u003c\u003c\u003c incorrect if user ARP Policer was applied on an AE interface and the default ARP Policer is displayed Policer: Input: jtac-arp-ae5.317-inet-arp \u003c\u003c\u003c correct if user ARP Policer was applied on an AE interface For all platforms, except SRX Series: This issue affects Juniper Networks Junos OS: All versions 5.6R1 and all later versions prior to 18.4 versions prior to 18.4R2-S9, 18.4R3-S9 with the exception of 15.1 versions 15.1R7-S10 and later versions; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2; This issue does not affect Juniper Networks Junos OS versions prior to 5.6R1. On SRX Series this issue affects Juniper Networks Junos OS: 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.4 versions prior to 19.4R3-S4; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. This issue does not affect 18.4 versions prior to 18.4R1 on SRX Series. This issue does not affect Junos OS Evolved."
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        ],
        "generator": {
          "engine": "Vulnogram 0.0.9"
        },
        "impact": {
          "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://kb.juniper.net/JSA11191",
              "refsource": "CONFIRM",
              "url": "https://kb.juniper.net/JSA11191"
            }
          ]
        },
        "solution": [
          {
            "lang": "en",
            "value": "The following software releases have been updated to resolve this specific issue: For all platforms, except SRX Series, using Junos OS 15.1R7-S10, 18.4R2-S9, 18.4R3-S9, 19.4R3-S4, 20.1R3, 20.2R3-S2, 20.4R3, 21.1R2, 21.2R1, and all subsequent releases. On SRX series using Junos OS 18.4R2-S9, 18.4R3-S9, 19.4R3-S4. 20.1R3, 20.4R3, 21.1R2, 21.2R1, and all subsequent releases."
          }
        ],
        "source": {
          "advisory": "JSA11191",
          "defect": [
            "1528403"
          ],
          "discovery": "USER"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "There is no workaround for this issue. \n\nIf affected by this issue, to recover from its impact, restart the firewall process to update the ARP Policer on the AE interface unit(s).  \nFrom the CLI issue: \n\n  cli\u003e restart firewall \n\nNote: no side effects on firewall restart shall be seen when issuing this command."
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
    "assignerShortName": "juniper",
    "cveId": "CVE-2021-0289",
    "datePublished": "2021-07-15T20:01:05.615Z",
    "dateReserved": "2020-10-27T00:00:00.000Z",
    "dateUpdated": "2024-09-17T03:48:59.800Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.