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2020-10 Security Bulletin: Junos OS: Reflected Cross-site Scripting vulnerability in J-Web and web based (HTTP/HTTPS) services (CVE-2020-1673)

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Article ID: JSA11070 SECURITY_ADVISORIES Last Updated: 14 Oct 2020Version: 1.0
Product Affected:
This issue affects Junos OS 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1.
Problem:

Insufficient Cross-Site Scripting (XSS) protection in Juniper Networks J-Web and web based (HTTP/HTTPS) services allows an unauthenticated attacker to hijack the target user's HTTP/HTTPS session and perform administrative actions on the Junos device as the targeted user.

This issue only affects Juniper Networks Junos OS devices with HTTP/HTTPS services enabled such as J-Web, Web Authentication, Dynamic-VPN (DVPN), Firewall Authentication Pass-Through with Web-Redirect, and Zero Touch Provisioning (ZTP).

Junos OS devices with HTTP/HTTPS services disabled are not affected.

If HTTP/HTTPS services are enabled, the following command will show the httpd processes:

user@device> show system processes | match http
5260 - S 0:00.13 /usr/sbin/httpd-gk -N
5797 - I 0:00.10 /usr/sbin/httpd --config /jail/var/etc/httpd.conf

In order to successfully exploit this vulnerability, the attacker needs to convince the device administrator to take action such as clicking the crafted URL sent via phishing email or convince the administrator to input data in the browser console.
 

This issue affects Juniper Networks Junos OS:

  • 18.1 versions prior to 18.1R3-S1;
  • 18.2 versions prior to 18.2R3-S5;
  • 18.3 versions prior to 18.3R2-S4, 18.3R3-S2;
  • 18.4 versions prior to 18.4R2-S5, 18.4R3-S2;
  • 19.1 versions prior to 19.1R2-S2, 19.1R3-S1;
  • 19.2 versions prior to 19.2R1-S5, 19.2R2;
  • 19.3 versions prior to 19.3R2-S4, 19.3R3;
  • 19.4 versions prior to 19.4R1-S3, 19.4R2;
  • 20.1 versions prior to 20.1R1-S2, 20.1R2.

This issue does not affect Juniper Networks Junos OS prior to 18.1R1.
 

The examples of the config stanza affected by this issue:

[system services web-management http]
[system services web-management https]
[security dynamic-vpn]

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

This issue was discovered during an external security research.

This issue has been assigned CVE-2020-1673.

Solution:

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

This issue is being tracked as 1493385.

Workaround:

There are no viable workarounds for this issue.

Implementation:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.
Modification History:
2020-10-14: Initial Publication.
CVSS Score:
8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Severity Level:
High
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."
Acknowledgements:
The Juniper SIRT would like to acknowledge and thank Mritunjay Bhardwaj mritunjay(dot)b(at)hcl(dot)com for reporting this issue.

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