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2019-10 Security Bulletin: Junos OS: Session fixation vulnerability in J-Web (CVE-2019-0062)

  [JSA10961] Show Article Properties

Product Affected:
This issue affects Junos OS 12.3, 12.3X48, 14.1X53, 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1.

A session fixation vulnerability in J-Web on Junos OS may allow an attacker to use social engineering techniques to fix and hijack a J-Web administrators web session and potentially gain administrative access to 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-D85 on SRX Series;

14.1X53 versions prior to 14.1X53-D51;

15.1 versions prior to 15.1F6-S13, 15.1R7-S5;

15.1X49 versions prior to 15.1X49-D180 on SRX Series;

15.1X53 versions prior to 15.1X53-D238;

16.1 versions prior to 16.1R4-S13, 16.1R7-S5;

16.2 versions prior to 16.2R2-S10;

17.1 versions prior to 17.1R3-S1;

17.2 versions prior to 17.2R2-S8, 17.2R3-S3;

17.3 versions prior to 17.3R3-S5;

17.4 versions prior to 17.4R2-S8, 17.4R3;

18.1 versions prior to 18.1R3-S8;

18.2 versions prior to 18.2R3;

18.3 versions prior to 18.3R3;

18.4 versions prior to 18.4R2;

19.1 versions prior to 19.1R1-S2, 19.1R2.

This issue requires J-Web to be enabled on the device.

The examples of the config stanza affected by this issue:

system services web-management http
system services web-management https

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-2019-0062.


The following software releases have been updated to resolve this specific issue: 12.3R12-S15*, 12.3X48-D85, 14.1X53-D51, 15.1F6-S13, 15.1R7-S5, 15.1X49-D180, 15.1X53-D238, 16.1R4-S13, 16.1R7-S5, 16.2R2-S10, 17.1R3-S1, 17.2R2-S8, 17.2R3-S3, 17.3R3-S5, 17.4R2-S8, 17.4R3*, 18.1R3-S8*, 18.2R3, 18.3R3, 18.4R2, 19.1R1-S2, 19.1R2, 19.2R1, and all subsequent releases.

*pending publication

This issue is being tracked as PR 1410401 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).


Use access control lists or firewall filters to limit access to Junos J-Web interface to only trusted users and networks to reduce risks of exploitation of this vulnerability.

Using common BCPs of safe web browsing such as not clicking on links in email or other media would reduce risks of exploitation of this vulnerability.

Disabling J-Web would completely prevent any exploitation of this issue.

Software Releases, patches and updates are available at
Modification History:
2019-10-09: Initial Publication.
Related Links:
CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
Risk Level:
The Juniper SIRT would like to would like to acknowledge and thank Farid Heydari for finding and reporting this issue.