CVE-2024-23644: trillium-http and trillium-client vulnerable to HTTP Request/Response Splitting
Description
Trillium is a composable toolkit for building internet applications with async rust. In `trillium-http` prior to 0.3.12 and `trillium-client` prior to 0.5.4, insufficient validation of outbound header values may lead to request splitting or response splitting attacks in scenarios where attackers have sufficient control over headers. This only affects use cases where attackers have control of request headers, and can insert "\r\n" sequences. Specifically, if untrusted and unvalidated input is inserted into header names or values.
Outbound `trillium_http::HeaderValue` and `trillium_http::HeaderName` can be constructed infallibly and were not checked for illegal bytes when sending requests from the client or responses from the server. Thus, if an attacker has sufficient control over header values (or names) in a request or response that they could inject `\r\n` sequences, they could get the client and server out of sync, and then pivot to gain control over other parts of requests or responses. (i.e. exfiltrating data from other requests, SSRF, etc.)
In `trillium-http` versions 0.3.12 and later, if a header name is invalid in server response headers, the specific header and any associated values are omitted from network transmission. Additionally, if a header value is invalid in server response headers, the individual header value is omitted from network transmission. Other headers values with the same header name will still be sent. In `trillium-client` versions 0.5.4 and l...
Classification
CVE ID: CVE-2024-23644
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.8
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Problem Types
CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Affected Products
Vendor: trillium-rs
Product: trillium
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.38% (probability of being exploited)
EPSS Percentile: 58.83% (scored less or equal to compared to others)
EPSS Date: 2025-06-16 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: none
SSVC Technical Impact: total
SSVC Automatable: false
References
https://nvd.nist.gov/vuln/detail/CVE-2024-23644https://github.com/trillium-rs/trillium/security/advisories/GHSA-9f9p-cp3c-72jf
https://github.com/trillium-rs/trillium/commit/16a42b3f8378a3fa4e61ece3e3e37e6a530df51d
https://github.com/trillium-rs/trillium/commit/8d468f85e27b8d0943d6f43ce9f8c7397141a999