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2021-07 Security Bulletin: Junos OS and Junos OS Evolved: Multiple vulnerabilities in cURL resolved

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Article ID: JSA11207 SECURITY_ADVISORIES Last Updated: 20 Jul 2021Version: 3.0
Product Affected:
These issues affect all versions of Junos OS and Junos OS Evolved.
Problem:

Multiple vulnerabilities have been resolved in Juniper Networks Junos OS and Junos OS Evolved by updating cURL third party software. These vulnerabilities may allow an attacker who tricks an administrator with access to the CLI to reference a malicious URL, to expose information, or cause a Denial of Service (DoS) condition.

This issue affects:

Juniper Networks Junos OS:

  • all versions prior to 15.1R7-S9;
  • 17.3 versions prior to 17.3R3-S12;
  • 17.4 versions prior to 17.4R3-S5;
  • 18.1 versions prior to 18.1R3-S13;
  • 18.2 version 18.2R1 and later versions;
  • 18.3 versions prior to 18.3R3-S5;
  • 18.4 versions prior to 18.4R2-S9, 18.4R3-S9;
  • 19.1 versions prior to 19.1R3-S5;
  • 19.2 versions prior to 19.2R3-S2;
  • 19.3 versions prior to 19.3R2-S6, 19.3R3-S2;
  • 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3;
  • 20.1 versions prior to 20.1R2-S2, 20.1R3;
  • 20.2 versions prior to 20.2R2-S3, 20.2R3;
  • 20.3 versions prior to 20.3R2;
  • 20.4 versions prior to 20.4R1-S1, 20.4R2.

Juniper Networks Junos OS Evolved versions prior to 20.4R2-EVO.

This issue was discovered during external security research.

Security issues resolved include:

CVE CVSS Summary
CVE-2020-8284 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N) A malicious server can use the FTP PASV response to trick curl 7.73.0 and earlier into connecting back to a given IP address and port, and this way potentially make curl extract information about services that are otherwise private and not disclosed, for example doing port scanning and service banner extractions.
CVE-2020-8286 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) curl 7.41.0 through 7.73.0 is vulnerable to an improper check for certificate revocation due to insufficient verification of the OCSP response.
CVE-2020-8285 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing.
 
Solution:

The following software releases have been updated to resolve these specific issues:

Junos OS 15.1R7-S9, 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R2-S9*, 18.4R3-S9*, 19.1R3-S5, 19.2R3-S2, 19.3R2-S6, 19.3R3-S2, 19.4R1-S4, 19.4R2-S4, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R1-S1, 20.4R2, 21.1R1, and all subsequent releases.

Junos OS Evolved 20.4R2-EVO, 21.1R1-EVO, and all subsequent releases.

*Late availability

This issue is being tracked as 1575921 and 1562153.
 

Workaround:
Use access lists or firewall filters to limit access to the device via CLI only from trusted hosts and administrators.
 
Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
 
Modification History:
2021-07-14: Initial Publication.
2021-07-20: Updated PRODUCT AFFECTED field to match PROBLEM text.

CVSS Score:
6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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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