CVE-2021-0247 (GCVE-0-2021-0247)

Vulnerability from cvelistv5 – Published: 2021-04-22 19:37 – Updated: 2024-09-16 17:27
VLAI?
Title
Junos OS: PTX Series, QFX Series: Due to a race condition input loopback firewall filters applied to interfaces may not operate even when listed in the running configuration.
Summary
A Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization) vulnerability in the firewall process (dfwd) of Juniper Networks Junos OS allows an attacker to bypass the firewall rule sets applied to the input loopback filter on any interfaces of a device. This issue is detectable by reviewing the PFE firewall rules, as well as the firewall counters and seeing if they are incrementing or not. For example: show firewall Filter: __default_bpdu_filter__ Filter: FILTER-INET-01 Counters: Name Bytes Packets output-match-inet 0 0 <<<<<< missing firewall packet count This issue affects: Juniper Networks Junos OS 14.1X53 versions prior to 14.1X53-D53 on QFX Series; 14.1 versions 14.1R1 and later versions prior to 15.1 versions prior to 15.1R7-S6 on QFX Series, PTX Series; 15.1X53 versions prior to 15.1X53-D593 on QFX Series; 16.1 versions prior to 16.1R7-S7 on QFX Series, PTX Series; 16.2 versions prior to 16.2R2-S11, 16.2R3 on QFX Series, PTX Series; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2 on QFX Series, PTX Series; 17.2 versions prior to 17.2R1-S9, 17.2R3-S3 on QFX Series, PTX Series; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7 on QFX Series, PTX Series; 17.4 versions prior to 17.4R2-S9, 17.4R3 on QFX Series, PTX Series; 18.1 versions prior to 18.1R3-S9 on QFX Series, PTX Series; 18.2 versions prior to 18.2R2-S6, 18.2R3-S3 on QFX Series, PTX Series; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1 on QFX Series, PTX Series; 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R2-S7, 18.4R3 on QFX Series, PTX Series; 19.1 versions prior to 19.1R1-S4, 19.1R2-S1, 19.1R3 on QFX Series, PTX Series; 19.2 versions prior to 19.2R1-S3, 19.2R2 on QFX Series, PTX Series.
Severity ?
5.1 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L
CWE
  • CWE-362 - Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 14.1X53 , < 14.1X53-D53 (custom)
Affected: 15.1X53 , < 15.1X53-D593 (custom)
Create a notification for this product.
    Juniper Networks Junos OS Affected: 14.1R1 , < 14.1* (custom)
Affected: 15.1 , < 15.1R7-S6 (custom)
Affected: 16.1 , < 16.1R7-S7 (custom)
Affected: 16.2 , < 16.2R2-S11, 16.2R3 (custom)
Affected: 17.1 , < 17.1R2-S11, 17.1R3-S2 (custom)
Affected: 17.2 , < 17.2R1-S9, 17.2R3-S3 (custom)
Affected: 17.3 , < 17.3R2-S5, 17.3R3-S7 (custom)
Affected: 17.4 , < 17.4R2-S9, 17.4R3 (custom)
Affected: 18.1 , < 18.1R3-S9 (custom)
Affected: 18.2 , < 18.2R2-S6, 18.2R3-S3 (custom)
Affected: 18.3 , < 18.3R1-S7, 18.3R2-S3, 18.3R3-S1 (custom)
Affected: 18.4 , < 18.4R1-S5, 18.4R2-S3, 18.4R3 (custom)
Affected: 19.1 , < 19.1R1-S4, 19.1R2-S1, 19.1R3 (custom)
Affected: 19.2 , < 19.2R1-S3, 19.2R2 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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    "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
    "assignerShortName": "juniper",
    "cveId": "CVE-2021-0247",
    "datePublished": "2021-04-22T19:37:10.823Z",
    "dateReserved": "2020-10-27T00:00:00.000Z",
    "dateUpdated": "2024-09-16T17:27:51.065Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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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.