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2021-04 Security Bulletin: Junos OS: J-Web: Cross-site scripting attack allows an attacker to gain control of another users session. (CVE-2021-0275)

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Article ID: JSA11166 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 1.0
Product Affected:
This issue affects Junos OS 12.3, 12.3X48, 15.1, 15.1X49, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3.
Problem:

A Cross-site Scripting (XSS) vulnerability in J-Web on Juniper Networks Junos OS allows an attacker to target another user's session thereby gaining access to the users session. The other user session must be active for the attack to succeed. Once successful, the attacker has the same privileges as the user. If the user has root privileges, the attacker may be able to gain full control of the device.

This issue affects:

Juniper Networks Junos OS:

  • 12.3 versions prior to 12.3R12-S15 on EX Series;
  • 12.3X48 versions prior to 12.3X48-D95 on SRX Series;
  • 15.1 versions prior to 15.1R7-S6 on EX Series;
  • 15.1X49 versions prior to 15.1X49-D200 on SRX Series;
  • 16.1 versions prior to 16.1R7-S7;
  • 16.2 versions prior to 16.2R2-S11, 16.2R3;
  • 17.1 versions prior to 17.1R2-S11, 17.1R3-S2;
  • 17.2 versions prior to 17.2R3-S3;
  • 17.3 versions prior to 17.3R2-S5, 17.3R3-S7;
  • 17.4 versions prior to 17.4R2-S9, 17.4R3;
  • 18.1 versions prior to 18.1R3-S9;
  • 18.2 versions prior to 18.2R2-S7, 18.2R3-S3;
  • 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1;
  • 18.4 versions prior to 18.4R1-S6, 18.4R2-S4, 18.4R3;
  • 19.1 versions prior to 19.1R2-S1, 19.1R3;
  • 19.2 versions prior to 19.2R1-S3, 19.2R2;
  • 19.3 versions prior to 19.3R2.

The following minimal configuration is necessary:

[system services web-management http]

or

[system services web-management https]

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2021-0275.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 12.3R12-S15, 12.3X48-D95, 15.1R7-S6, 15.1X49-D200, 16.1R7-S7, 16.2R2-S11, 16.2R3, 17.1R2-S11, 17.1R3-S2, 17.2R3-S3, 17.3R2-S5, 17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S9, 18.2R2-S7, 18.2R3-S3, 18.3R1-S7, 18.3R2-S3, 18.3R3-S1, 18.4R1-S6, 18.4R2-S4, 18.4R3, 19.1R2-S1, 19.1R3, 19.2R1-S3, 19.2R2, 19.3R2, 19.4R1, and all subsequent releases.

This issue is being tracked as 1460150.

Workaround:

There are no viable workarounds for this issue other than disabling J-Web.

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to J-Web to only trusted administrative networks, hosts and users.

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:
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."

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