CVE-2023-6937
wolfSSL (D)TLS Key Boundary Check Vulnerability
Description
wolfSSL prior to 5.6.6 did not check that messages in one (D)TLS record do not span key boundaries. As a result, it was possible to combine (D)TLS messages using different keys into one (D)TLS record. The most extreme edge case is that, in (D)TLS 1.3, it was possible that an unencrypted (D)TLS 1.3 record from the server containing first a ServerHello message and then the rest of the first server flight would be accepted by a wolfSSL client. In (D)TLS 1.3 the handshake is encrypted after the ServerHello but a wolfSSL client would accept an unencrypted flight from the server. This does not compromise key negotiation and authentication so it is assigned a low severity rating.
INFO
Published Date :
Feb. 15, 2024, 6:15 p.m.
Last Modified :
Feb. 15, 2024, 7:55 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2023-6937 has a 1 public PoC/Exploit
available at Github.
Go to the Public Exploits
tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-6937
.
URL | Resource |
---|---|
https://github.com/wolfSSL/wolfssl/pull/7029 | |
https://www.wolfssl.com/docs/security-vulnerabilities/ |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
wolfssl for windows 98 (coming soon)
CMake Dockerfile Shell C++ C Makefile Euphoria Batchfile BitBake FreeMarker
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-6937
vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-6937
vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Received by [email protected]
Feb. 15, 2024
Action Type Old Value New Value Added Description wolfSSL prior to 5.6.6 did not check that messages in one (D)TLS record do not span key boundaries. As a result, it was possible to combine (D)TLS messages using different keys into one (D)TLS record. The most extreme edge case is that, in (D)TLS 1.3, it was possible that an unencrypted (D)TLS 1.3 record from the server containing first a ServerHello message and then the rest of the first server flight would be accepted by a wolfSSL client. In (D)TLS 1.3 the handshake is encrypted after the ServerHello but a wolfSSL client would accept an unencrypted flight from the server. This does not compromise key negotiation and authentication so it is assigned a low severity rating. Added Reference wolfSSL Inc. https://github.com/wolfSSL/wolfssl/pull/7029 [No types assigned] Added Reference wolfSSL Inc. https://www.wolfssl.com/docs/security-vulnerabilities/ [No types assigned] Added CWE wolfSSL Inc. CWE-20 Added CVSS V3.1 wolfSSL Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-6937
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-6937
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.06714
percentile