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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
CVE Names: CVE-2018-15505 CVE-2018-15504
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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
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
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
Disable J-Web, or limit access to only trusted hosts.
Software Releases, patches and updates are available at https://www.juniper.net
o 2019-07-10: Initial Publication
o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
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
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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