2.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-26049

CVE-2023-26049: Eclipse Jetty's cookie parsing of quoted values can exfiltrate values from other cookies

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.

Impact

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.

Patches

9.4.51.v20230217 - via PR #9352
10.0.15 - via PR #9339
11.0.15 - via PR #9339

Workarounds

No workarounds

References

https://www.rfc-editor.org/rfc/rfc2965
https://www.rfc-editor.org/rfc/rfc6265

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2023-26049

CVE-2023-26049:

2.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.eclipse.jetty:jetty-server	maven	>= 10.0.0, < 10.0.14	10.0.14
org.eclipse.jetty:jetty-server	maven	>= 11.0.0, < 11.0.14	11.0.14
org.eclipse.jetty:jetty-server	maven	>= 12.0.0alpha0, < 12.0.0.beta0	12.0.0.beta0
org.eclipse.jetty:jetty-server	maven	< 9.4.51.v20230217	9.4.51.v20230217

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability CVE-2023-26049 stems from nonstandard cookie parsing in Jetty. The patches (PR #9339 and #9352) specifically modified the CookieCutter class to address improper handling of quoted values. The parseFields() method in CookieCutter was responsible for splitting cookie headers and failed to terminate quoted values at semicolons, allowing attackers to smuggle cookies. The commit diffs show changes to cookie parsing logic, confirming this function's role in the vulnerability.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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