CVE-2019-5101
First published: Mon Nov 18 2019(Updated: )
An exploitable information leak vulnerability exists in the ustream-ssl library of OpenWrt, versions 18.06.4 and 15.05.1. When connecting to a remote server, the server's SSL certificate is checked but no action is taken when the certificate is invalid. An attacker could exploit this behavior by performing a man-in-the-middle attack, providing any certificate, leading to the theft of all the data sent by the client during the first request.An exploitable information leak vulnerability exists in the ustream-ssl library of OpenWrt, versions 18.06.4 and 15.05.1. When connecting to a remote server, the server's SSL certificate is checked but no action is taken when the certificate is invalid. An attacker could exploit this behavior by performing a man-in-the-middle attack, providing any certificate, leading to the theft of all the data sent by the client during the first request. After an SSL connection is initialized via _ustream_ssl_init, and after any data (e.g. the client's HTTP request) is written to the stream using ustream_printf, the code eventually enters the function _ustream_ssl_poll, which is used to dispatch the read/write events
Credit: talos-cna@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| OpenWrt OpenWrt | =15.05.1 | |
| OpenWrt OpenWrt | =18.06.4 |
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Frequently Asked Questions
What is the vulnerability ID of this information leak vulnerability?
The vulnerability ID of this information leak vulnerability is CVE-2019-5101.
What is the affected software?
The affected software is OpenWrt versions 18.06.4 and 15.05.1.
What is the severity rating of CVE-2019-5101?
The severity rating of CVE-2019-5101 is medium with a CVSS score of 5.9.
How can this vulnerability be exploited?
An attacker could exploit this vulnerability by performing a man-in-the-middle attack to intercept the communication between the OpenWrt device and a remote server.
Is there a fix available for this vulnerability?
Yes, a fix is available in the form of updates for OpenWrt versions 18.06.4 and 15.05.1. It is recommended to update to the latest version to mitigate the vulnerability.
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