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2021-04 Security Bulletin: Junos OS: SRX Series: An assertion failure in BIND can be used to trigger a Denial of Service (DoS) (CVE-2020-8622)

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Article ID: JSA11116 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 2.0
Product Affected:
This issue affects Junos OS 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2.
Problem:

A vulnerability in BIND, used in Juniper Networks Junos OS on SRX Series devices, may allow an attacker on the network path for a transaction signature-signed request (TSIG-signed request), to trigger an assertion failure, resulting in a Denial of Service (DoS).
Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to cause a Denial of Service (DoS) condition.

This issue only affect SRX Series devices, which is the only platform that ships with BIND software. No other products or platforms are affected by this vulnerability.

This issue affects Juniper Networks Junos OS on SRX Series:

  • 17.3 versions prior to 17.3R3-S11;
  • 17.4 versions prior to 17.4R2-S12, 17.4R3-S3;
  • 18.1 versions prior to 18.1R3-S11;
  • 18.2 versions prior to 18.2R2-S8, 18.2R3-S7;
  • 18.3 versions prior to 18.3R3-S4;
  • 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S6;
  • 19.1 versions prior to 19.1R1-S6, 19.1R3-S4;
  • 19.2 versions prior to 19.2R1-S6, 19.2R3-S1;
  • 19.3 versions prior to 19.3R2-S5, 19.3R3-S1;
  • 19.4 versions prior to 19.4R2-S2, 19.4R3;
  • 20.1 versions prior to 20.1R2;
  • 20.2 versions prior to 20.2R1-S3, 20.2R2, 20.2R3.

The following minimal configuration is required:

[system services dns dns-proxy cache "dns name" inet "ip address"]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was discovered during a external security research.

This issue has been assigned CVE-2020-8622.

Solution:

The following software releases have been updated to resolve this specific issue: 17.3R3-S11, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R2-S8, 18.2R3-S7, 18.3R3-S4, 18.4R1-S8, 18.4R2-S7, 18.4R3-S6, 19.1R1-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R2-S2, 19.4R3, 20.1R2, 20.2R1-S3, 20.2R2, 20.2R3, 20.3R1, and all subsequent releases.

Workaround:

There are no viable workarounds for this issue.

Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
Modification History:
2021-04-14: Initial Publication.
CVSS Score:
6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Medium
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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