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Vulnerability of Junos OS: directory traversal via J-Web

Synthesis of the vulnerability 

An attacker can traverse directories via J-Web of Junos OS, in order to read/write a file outside the service root path.
Vulnerable software: Juniper EX-Series, Juniper J-Series, Junos OS, MX-Series, SRX-Series.
Severity of this announce: 2/4.
Creation date: 09/01/2020.
Références of this computer vulnerability: CERTFR-2020-AVI-015, CVE-2020-1606, JSA10985, VIGILANCE-VUL-31279.

Description of the vulnerability 

The Junos OS product offers a web service.

However, user's data are directly inserted in an access path. Sequences such as "/.." can thus be used to go in the upper directory.

An attacker can therefore traverse directories via J-Web of Junos OS, in order to read/write a file outside the service root path.
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This cybersecurity announce impacts software or systems such as Juniper EX-Series, Juniper J-Series, Junos OS, MX-Series, SRX-Series.

Our Vigil@nce team determined that the severity of this threat alert is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer weakness alert.

Solutions for this threat 

Junos OS: fixed versions for J-Web.
Fixed versions are indicated in information sources.
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