CVE-2023-26125
Improper Input Validation vulnerability in gin (Go)
What is CVE-2023-26125 About?
This vulnerability in github.com/gin-gonic/gin before version 1.9.0 is an Improper Input Validation flaw, allowing attackers to use a specially crafted `X-Forwarded-Prefix` header. This can potentially lead to cache poisoning, serving as an input vector for other, more impactful vulnerabilities. Exploitation depends on server configuration and application logic.
Affected Software
Technical Details
Versions of the github.com/gin-gonic/gin package prior to 1.9.0 are vulnerable to Improper Input Validation concerning the X-Forwarded-Prefix HTTP header. An attacker can create a specially crafted value for this header, which the gin framework may incorrectly process or validate. This manipulation can lead to cache poisoning, where an attacker's malicious content is stored in a caching layer and subsequently served to legitimate users. While this vulnerability might not directly lead to immediate high-impact consequences, it can act as a crucial precursor or an 'input vector' for chaining with other vulnerabilities to achieve more severe attacks, such as cross-site scripting (XSS) or deeper unauthorized access, depending on how the application utilizes this header in its logic and how the cache is configured.
What is the Impact of CVE-2023-26125?
Successful exploitation may allow attackers to perform cache poisoning, potentially leading to the delivery of malicious content to users or facilitating further, more impactful attacks.
What is the Exploitability of CVE-2023-26125?
Exploitation involves crafting and sending an HTTP request with a malicious X-Forwarded-Prefix header. The complexity is low. No specific authentication or privilege requirements are needed to send this header. This is a remote exploitation scenario, attacking a web server running a vulnerable version of gin. The success and impact of exploitation are highly dependent on the server's cache configuration, whether the X-Forwarded-Prefix header is used in the application's logic or by proxies, and whether other vulnerabilities can chain with cache poisoning. It is primarily a risk factor for enabling more severe attacks, thus increasing the overall attack surface.
What are the Known Public Exploits?
| PoC Author | Link | Commentary |
|---|---|---|
| No known exploits | ||
What are the Available Fixes for CVE-2023-26125?
About the Fix from Resolved Security
The patch fixes CVE-2023-26125 by sanitizing the X-Forwarded-Prefix header: instead of blindly escaping it, the new code strips all non-alphanumeric and non-path characters, and collapses multiple slashes, thus preventing path traversal or header injection. This mitigates the vulnerability where malicious prefixes could result in crafted or unsafe redirect URLs.
Available Upgrade Options
- github.com/gin-gonic/gin
- <1.9.0 → Upgrade to 1.9.0
Struggling with dependency upgrades?
See how Resolved Security's drop-in replacements make it simple.
Book a demoAdditional Resources
- https://github.com/t0rchwo0d/gin/commit/fd9f98e70fb4107ee68c783482d231d35e60507b
- https://nvd.nist.gov/vuln/detail/CVE-2023-26125
- https://github.com/gin-gonic/gin/pull/3500
- https://osv.dev/vulnerability/GHSA-3vp4-m3rf-835h
- https://github.com/gin-gonic/gin/pull/3503
- https://github.com/gin-gonic/gin/releases/tag/v1.9.0
- https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGINGONICGIN-3324285
- https://github.com/gin-gonic/gin/pull/3500
- https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGINGONICGIN-3324285
- https://github.com/gin-gonic/gin/pull/3503
What are Similar Vulnerabilities to CVE-2023-26125?
Similar Vulnerabilities: CVE-2020-28188 , CVE-2020-13435 , CVE-2021-33190 , CVE-2022-2921 , CVE-2021-38321
