FortiProxy SSL VPN: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0406
  FortiProxy SSL VPN buffer overflow when parsing javascript href content
                              5 February 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           FortiProxy SSL VPN
Publisher:         FortiGuard
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-13383  

Reference:         ESB-2019.1114.4

Original Bulletin: 
   https://www.fortiguard.com/psirt/FG-IR-20-229

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FortiProxy SSL VPN buffer overflow when parsing javascript href content

IR Number : FG-IR-20-229

Date      : Feb 01, 2021

Risk      : 3/5

CVSSv3 Score: 4.2

Impact    : denial of service, Remote Code Execution

CVE ID    : CVE-2018-13383

Summary

A heap buffer overflow vulnerability in the FortiProxy SSL VPN web portal may
cause the SSL VPN web service termination for logged in users or potential
remote code execution on FortiProxy. This happens when an authenticated user
visits a specifically crafted proxied webpage and is due to a failure to handle
Javascript HREF content properly.

Impact

denial of service, Remote Code Execution

Affected Products

FortiProxy version 2.0.0 FortiProxy versions 1.2.8 and below. FortiProxy
versions 1.1.6 and below. FortiProxy versions 1.0.7 and below.

Solutions

Please upgrade to FortiProxy versions 2.0.1 or above. Please upgrade to
FortiProxy versions 1.2.9 or above.

Acknowledgement

Fortinet is pleased to thank Meh Chang and Orange Tsai from DEVCORE Security
Research Team for reporting this vulnerability under responsible disclosure.

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