CVE-2019-11873: Buffer Overflow
First published: Thu May 23 2019(Updated: )
wolfSSL 4.0.0 has a Buffer Overflow in DoPreSharedKeys in tls13.c when a current identity size is greater than a client identity size. An attacker sends a crafted hello client packet over the network to a TLSv1.3 wolfSSL server. The length fields of the packet: record length, client hello length, total extensions length, PSK extension length, total identity length, and identity length contain their maximum value which is 2^16. The identity data field of the PSK extension of the packet contains the attack data, to be stored in the undefined memory (RAM) of the server. The size of the data is about 65 kB. Possibly the attacker can perform a remote code execution attack.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| WolfSSL wolfssl | =4.0 |
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Reference Links
- http://www.securityfocus.com/bid/108466
- https://www.telekom.com/en/corporate-responsibility/data-protection-data-security/security/details/advisories-504842
- https://www.telekom.com/resource/blob/572524/1c89c1cbaccdf792153063b3a10af10e/dl-190515-remote-buffer-overflow-vulnerability-wolfssl-library-data.pdf
Frequently Asked Questions
What is the severity of CVE-2019-11873?
The severity of CVE-2019-11873 is critical with a CVSS score of 9.8.
What is the affected software version of CVE-2019-11873?
The affected software version of CVE-2019-11873 is wolfSSL 4.0.0.
What is the vulnerability type of CVE-2019-11873?
The vulnerability type of CVE-2019-11873 is a Buffer Overflow.
How can an attacker exploit CVE-2019-11873?
An attacker can exploit CVE-2019-11873 by sending a crafted hello client packet over the network to a TLSv1.3 wolfSSL server.
Are there any references for CVE-2019-11873?
Yes, you can find more information about CVE-2019-11873 at the following references: [Link 1](http://www.securityfocus.com/bid/108466), [Link 2](https://www.telekom.com/en/corporate-responsibility/data-protection-data-security/security/details/advisories-504842), [Link 3](https://www.telekom.com/resource/blob/572524/1c89c1cbaccdf792153063b3a10af10e/dl-190515-remote-buffer-overflow-vulnerability-wolfssl-library-data.pdf)
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