CVE-2023-27495
Fastify CSRF Protection Token Bypass
Description
@fastify/csrf-protection is a plugin which helps protect Fastify servers against CSRF attacks. The CSRF protection enforced by the @fastify/csrf-protection library in combination with @fastify/cookie can be bypassed from network and same-site attackers under certain conditions. @fastify/csrf-protection supports an optional userInfo parameter that binds the CSRF token to the user. This parameter has been introduced to prevent cookie-tossing attacks as a fix for CVE-2021-29624. Whenever userInfo parameter is missing, or its value can be predicted for the target user account, network and same-site attackers can 1. fixate a _csrf cookie in the victim's browser, and 2. forge CSRF tokens that are valid for the victim's session. This allows attackers to bypass the CSRF protection mechanism. As a fix, @fastify/csrf-protection starting from version 6.3.0 (and v4.1.0) includes a server-defined secret hmacKey that cryptographically binds the CSRF token to the value of the _csrf cookie and the userInfo parameter, making tokens non-spoofable by attackers. This protection is effective as long as the userInfo parameter is unique for each user. This is patched in versions 6.3.0 and v4.1.0. Users are advised to upgrade. Users unable to upgrade may use a random, non-predictable userInfo parameter for each user as a mitigation.
INFO
Published Date :
April 20, 2023, 6:15 p.m.
Last Modified :
May 2, 2023, 2:07 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
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-2023-27495.
| URL | Resource |
|---|---|
| https://github.com/fastify/csrf-protection/commit/be3e5761f37aa05c7c1ac8ed44499c51ecec8058 | Patch |
| https://github.com/fastify/csrf-protection/security/advisories/GHSA-qrgf-9gpc-vrxw | Vendor Advisory |
| https://www.cvedetails.com/cve/CVE-2021-29624 | 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).
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The following list is the news that have been mention
CVE-2023-27495 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-27495 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 -
Initial Analysis by [email protected]
May. 02, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Changed Reference Type https://github.com/fastify/csrf-protection/commit/be3e5761f37aa05c7c1ac8ed44499c51ecec8058 No Types Assigned https://github.com/fastify/csrf-protection/commit/be3e5761f37aa05c7c1ac8ed44499c51ecec8058 Patch Changed Reference Type https://github.com/fastify/csrf-protection/security/advisories/GHSA-qrgf-9gpc-vrxw No Types Assigned https://github.com/fastify/csrf-protection/security/advisories/GHSA-qrgf-9gpc-vrxw Vendor Advisory Changed Reference Type https://www.cvedetails.com/cve/CVE-2021-29624 No Types Assigned https://www.cvedetails.com/cve/CVE-2021-29624 Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:fastify:csrf-protection:*:*:*:*:*:node.js:*:* versions up to (excluding) 4.1.0 *cpe:2.3:a:fastify:csrf-protection:*:*:*:*:*:node.js:*:* versions from (including) 5.0.0 up to (excluding) 6.3.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-27495 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-2023-27495
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.09 }} 0.00%
score
0.38681
percentile