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             AUSCERT External Security Bulletin Redistribution

JSA10948 - 2019-07 Security Bulletin: Junos OS: J-Web Denial of Service due
          to multiple vulnerabilities in Embedthis Appweb Server
                               12 July 2019


        AusCERT Security Bulletin Summary

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15505 CVE-2018-15504 

Original Bulletin: 

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2019-07 Security Bulletin: Junos OS: J-Web Denial of Service due to multiple 
vulnerabilities in Embedthis Appweb Server

Article ID:   JSA10948

Last Updated: 10 Jul 2019

Version:      2.0

Product Affected:
This issue affects all products and platforms running Junos OS with J-Web

Multiple vulnerabilities exist in the Embedthis Appweb server, used by J-Web,
related to the way the server mishandles some HTTP headers and request fields.
These issues may result in a Denial of Service (DoS) for the J-Web graphical
user interface.

These issues affect Juniper Networks Junos OS:

  o 12.3 versions prior to 12.3R12-S14;
  o 12.3X48 versions prior to 12.3X48-D80;
  o 15.1 versions prior to 15.1F6-S13, 15.1R7-S4;
  o 15.1X49 versions prior to 15.1X49-D170;
  o 15.1X53 versions prior to 15.1X53-D497;
  o 16.1 versions prior to 16.1R4-S13, 16.1R7-S5;
  o 16.2 versions prior to 16.2R2-S10;
  o 17.1 versions prior to 17.1R3;
  o 17.2 versions prior to 17.2R2-S7, 17.2R3-S1;
  o 17.3 versions prior to 17.3R3-S5;
  o 17.4 versions prior to 17.4R1-S7, 17.4R2-S4, 17.4R3;
  o 18.1 versions prior to 18.1R3-S5.

Important security issues resolved include:

     CVE            CVSS                           Summary
                              An issue was discovered in Embedthis GoAhead
               7.5 ( CVSS:3.0 before 4.0.1 and Appweb before 7.0.2. The server
               /AV:N/AC:L/    mishandles some HTTP request fields associated
CVE-2018-15504 PR:N/UI:N/S:U/ with time, which results in a NULL pointer
               C:N/I:N/A:H )  dereference, as demonstrated by If-Modified-Since
                              or If-Unmodified-Since with a month greater than
                              An issue was discovered in Embedthis GoAhead
               7.5 ( CVSS:3.0 before 4.0.1 and Appweb before 7.0.2. An HTTP
               /AV:N/AC:L/    POST request with a specially crafted "Host"
CVE-2018-15505 PR:N/UI:N/S:U/ header field may cause a NULL pointer dereference
               C:N/I:N/A:H )  and thus cause a denial of service, as
                              demonstrated by the lack of a trailing ']'
                              character in an IPv6 address.


The following software releases have been updated to resolve this specific
issue: 12.3R12-S14*, 12.3X48-D80, 15.1F6-S13, 15.1R7-S4, 15.1X49-D170,
15.1X53-D497, 16.1R4-S13, 16.1R7-S5, 16.2R2-S10, 17.1R3, 17.2R2-S7, 17.2R3-S1,
17.3R3-S5, 17.4R1-S7, 17.4R2-S4, 17.4R3, 18.1R3-S5, 18.2R1, and all subsequent

* Late availability

This issue is being tracked as PR 1345330 which is visible on the Customer
Support website.

Disable J-Web, or limit access to only trusted hosts.
Software Releases, patches and updates are available at https://www.juniper.net
/support/downloads/ .

Modification History:

  o 2019-07-10: Initial Publication

Related Links:

  o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
    Publication Process

  o KB16765: In which releases are vulnerabilities fixed

  o KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security

  o Report a Security Vulnerability - How to Contact the Juniper Networks
    Security Incident Response Team

  o CVE-2018-15504 at cve.mitre.org

  o CVE-2018-15505 at cve.mitre.org

CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Risk Level:

Risk 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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