Jetty Cookie Smuggling via Nonstandard Parsing (pre 9.4.51)
CVE-2023-26049 Published on April 18, 2023
Cookie parsing of quoted values can exfiltrate values from other cookies in Eclipse Jetty
Jetty is a java based web server and servlet engine. Nonstandard cookie parsing in Jetty may allow an attacker to smuggle cookies within other cookies, or otherwise perform unintended behavior by tampering with the cookie parsing mechanism. If Jetty sees a cookie VALUE that starts with `"` (double quote), it will continue to read the cookie string until it sees a closing quote -- even if a semicolon is encountered. So, a cookie header such as: `DISPLAY_LANGUAGE="b; JSESSIONID=1337; c=d"` will be parsed as one cookie, with the name DISPLAY_LANGUAGE and a value of b; JSESSIONID=1337; c=d instead of 3 separate cookies. This has security implications because if, say, JSESSIONID is an HttpOnly cookie, and the DISPLAY_LANGUAGE cookie value is rendered on the page, an attacker can smuggle the JSESSIONID cookie into the DISPLAY_LANGUAGE cookie and thereby exfiltrate it. This is significant when an intermediary is enacting some policy based on cookies, so a smuggled cookie can bypass that policy yet still be seen by the Jetty server or its logging system. This issue has been addressed in versions 9.4.51, 10.0.14, 11.0.14, and 12.0.0.beta0 and users are advised to upgrade. There are no known workarounds for this issue.
Vulnerability Analysis
CVE-2023-26049 can be exploited with network access, requires user interaction and user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2023-26049 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2023-26049
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-26049 are published in these products:
Affected Versions
eclipse jetty.project:- Version < 9.4.51 is affected.
- Version >= 10.0.0, < 10.0.14 is affected.
- Version >= 11.0.0, < 11.0.14 is affected.
- Version >= 12.0.0.alpha0, < 12.0.0.beta0 is affected.
Vulnerable Packages
The following package name and versions may be associated with CVE-2023-26049
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| maven | org.eclipse.jetty:jetty-server | >= 12.0.0alpha0, < 12.0.0.beta0 | 12.0.0.beta0 |
| maven | org.eclipse.jetty:jetty-server | >= 11.0.0, < 11.0.14 | 11.0.14 |
| maven | org.eclipse.jetty:jetty-server | >= 10.0.0, < 10.0.14 | 10.0.14 |
| maven | org.eclipse.jetty:jetty-server | < 9.4.51 | 9.4.51 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.