CVE-2021-0247 Details

CVE-2021-0247

Published: 2021-04-22
Last Modified: 2021-04-30
CVE Author: NIST National Vulnerability Database
CVE Assigner: sirt@juniper.net
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.

Analysis
Common Vulnerability Score System v2.0
Severity Medium
Base Score 6.8/10
Exploit Score 8.6/10
Access Vector Network
Access Complexity Medium
Authentication None
Impact Score 6.4/10
Confidentiality Impact Partial
Availability Impact Partial
Integrity Impact Partial
Vector String AV:N/AC:M/Au:N/C:P/I:P/A:P
Common Vulnerability Score System v3.1
Severity Medium
Base Score 5.5/10
Exploit Score 1.3/10
Access Vector Network
Access Complexity High
Privileges Required High
Impact Score 3.7/10
Confidentiality Impact Low
Availability Impact Low
Integrity Impact Low
Scope Changed
User Interaction None
Vector String CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L
Products Reported
CPE Vulnerable Start Excluding
References

https://kb.juniper.net/JSA11140

CVE ID
CVE-2021-0247
Published
2021-04-22
Modified
2021-04-30
CVSSv2.0
Medium
CVSSv3.1
Medium
PCI Compliance
Fail
US-CERT Alert
No
CWE
CWE-362

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