CVE-2023-38686
Sydent TLS Certificate Verification Vulnerability
Description
Sydent is an identity server for the Matrix communications protocol. Prior to version 2.5.6, if configured to send emails using TLS, Sydent does not verify SMTP servers' certificates. This makes Sydent's emails vulnerable to interception via a man-in-the-middle (MITM) attack. Attackers with privileged access to the network can intercept room invitations and address confirmation emails. This is patched in Sydent 2.5.6. When patching, make sure that Sydent trusts the certificate of the server it is connecting to. This should happen automatically when using properly issued certificates. Those who use self-signed certificates should make sure to copy their Certification Authority certificate, or their self signed certificate if using only one, to the trust store of your operating system. As a workaround, one can ensure Sydent's emails fail to send by setting the configured SMTP server to a loopback or non-routable address under one's control which does not have a listening SMTP server.
INFO
Published Date :
Aug. 4, 2023, 4:15 p.m.
Last Modified :
Aug. 10, 2023, 7:30 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.8
Exploitability Score :
2.8
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-2023-38686.
| URL | Resource |
|---|---|
| https://docs.python.org/3/library/ssl.html?highlight=ssl#security-considerations | Technical Description |
| https://github.com/matrix-org/sydent/commit/1cd748307c6b168b66154e6c4db715d4b9551261 | Patch |
| https://github.com/matrix-org/sydent/pull/574 | Issue Tracking Patch |
| https://github.com/matrix-org/sydent/releases/tag/v2.5.6 | Release Notes |
| https://github.com/matrix-org/sydent/security/advisories/GHSA-p6hw-wm59-3g5g | Vendor Advisory |
| https://github.com/python/cpython/issues/91826 | Issue Tracking |
| https://peps.python.org/pep-0476/ | Third Party Advisory |
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-38686 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-38686 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.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Aug. 10, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Changed Reference Type https://docs.python.org/3/library/ssl.html?highlight=ssl#security-considerations No Types Assigned https://docs.python.org/3/library/ssl.html?highlight=ssl#security-considerations Technical Description Changed Reference Type https://github.com/matrix-org/sydent/commit/1cd748307c6b168b66154e6c4db715d4b9551261 No Types Assigned https://github.com/matrix-org/sydent/commit/1cd748307c6b168b66154e6c4db715d4b9551261 Patch Changed Reference Type https://github.com/matrix-org/sydent/pull/574 No Types Assigned https://github.com/matrix-org/sydent/pull/574 Issue Tracking, Patch Changed Reference Type https://github.com/matrix-org/sydent/releases/tag/v2.5.6 No Types Assigned https://github.com/matrix-org/sydent/releases/tag/v2.5.6 Release Notes Changed Reference Type https://github.com/matrix-org/sydent/security/advisories/GHSA-p6hw-wm59-3g5g No Types Assigned https://github.com/matrix-org/sydent/security/advisories/GHSA-p6hw-wm59-3g5g Vendor Advisory Changed Reference Type https://github.com/python/cpython/issues/91826 No Types Assigned https://github.com/python/cpython/issues/91826 Issue Tracking Changed Reference Type https://peps.python.org/pep-0476/ No Types Assigned https://peps.python.org/pep-0476/ Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:* versions up to (excluding) 2.5.6
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-38686 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-2023-38686
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.05 }} -0.01%
score
0.20626
percentile