Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2025-11143 is a vulnerability in the URI parser of the Jetty HTTP server that causes it to handle invalid or unusual URIs differently compared to other common URI parsers.'}, {'type': 'paragraph', 'content': "This differential parsing means that when multiple components process the same URI, they may interpret it inconsistently. For example, one component might reject a URI due to a blacklist, while Jetty's parser might accept it, allowing potentially malicious URIs to bypass security controls."}, {'type': 'list_item', 'content': 'Jetty accepts malformed URI schemes (like "https>") that other parsers reject.'}, {'type': 'list_item', 'content': 'Jetty treats certain IPv4-mapped IPv6 addresses as invalid hosts, unlike other parsers.'}, {'type': 'list_item', 'content': "Jetty parses URIs with embedded delimiters (such as '@' symbols) differently, causing inconsistent host interpretations."}, {'type': 'list_item', 'content': 'Jetty interprets delimiters in URI fragments or query strings differently, affecting URI interpretation.'}, {'type': 'paragraph', 'content': 'At minimum, this discrepancy can leak implementation details and at worst can lead to security bypasses.'}] [1]

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Impact Analysis

[{'type': 'paragraph', 'content': 'The vulnerability can lead to security bypasses in systems that use multiple components for URI processing.'}, {'type': 'paragraph', 'content': "For example, a security component enforcing a blacklist might reject a malicious URI based on one parsing logic, but Jetty's parser might accept it, allowing the malicious URI to bypass security controls."}, {'type': 'paragraph', 'content': 'This can result in integrity loss, meaning unauthorized or malicious data could be processed or accepted.'}, {'type': 'paragraph', 'content': 'Additionally, the differential parsing may divulge implementation details, which could aid attackers in crafting exploits.'}, {'type': 'paragraph', 'content': 'The vulnerability has a low severity score (CVSS 3.7) and does not impact confidentiality or availability.'}] [1]

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability arises from Jetty's URI parser handling invalid or unusual URIs differently than other parsers, leading to inconsistent parsing results that may cause security bypasses."}, {'type': 'paragraph', 'content': 'Detection would involve testing how your Jetty server parses various malformed or unusual URIs, especially those with invalid schemes, IPv4-mapped IPv6 addresses, or unusual delimiter placements.'}, {'type': 'paragraph', 'content': 'You can attempt to send crafted HTTP requests with URIs such as:'}, {'type': 'list_item', 'content': 'URIs with invalid schemes like "https>://example.com"'}, {'type': 'list_item', 'content': 'URIs with IPv4-mapped IPv6 addresses like "http://[0:0:0:0:0:ffff:127.0.0.1]/" or "http://[::ffff:255.255.0.0]/"'}, {'type': 'list_item', 'content': 'URIs with embedded delimiters such as \'@\' symbols in hostnames, e.g., "http://[normal.com@]vulndetector.com/" or "http://normal.com[user@vulndetector].com/"'}, {'type': 'paragraph', 'content': 'By observing how your Jetty server responds to these requests compared to other components or parsers, you can detect differential parsing behavior indicative of this vulnerability.'}, {'type': 'paragraph', 'content': 'Specific commands could include using curl or similar tools to send these crafted requests, for example:'}, {'type': 'list_item', 'content': 'curl -v "http://https>://example.com/"'}, {'type': 'list_item', 'content': 'curl -v "http://[0:0:0:0:0:ffff:127.0.0.1]/"'}, {'type': 'list_item', 'content': 'curl -v "http://[normal.com@]vulndetector.com/"'}, {'type': 'paragraph', 'content': 'Comparing the responses or logs from Jetty with other URI parsers can help identify if the vulnerability is present.'}] [1]

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Mitigation Strategies

The primary mitigation for this vulnerability is to upgrade Jetty to a patched version.

• Upgrade to Jetty version 12.0.31 or 12.1.5 or later where the vulnerability is fixed.
• For older end-of-life releases (11.0.x, 10.0.x, 9.4.x), obtain patches from trusted third-party providers such as tuxcare or herodevs.

No workarounds are noted, so applying the official patches or upgrades is the recommended immediate action.

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