Vulnerability Information
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Vulnerability Title
Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling
Vulnerability Description
Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive comparison of the Transfer-Encoding header in src/reqs.c. The is_chunked_transfer() function uses strcmp() to compare the header value against "chunked", even though RFC 7230 specifies that transfer-coding names are case-insensitive. By sending a request with Transfer-Encoding: Chunked, an unauthenticated remote attacker can cause Tinyproxy to misinterpret the request as having no body. In this state, Tinyproxy sets content_length.client to -1, skips pull_client_data_chunked(), forwards request headers upstream, and transitions into relay_connection() raw TCP forwarding while unread body data remains buffered. This leads to inconsistent request state between Tinyproxy and backend servers. RFC-compliant backends (e.g., Node.js, Nginx) will continue waiting for chunked body data, causing connections to hang indefinitely. This behavior enables application-level denial of service through backend worker exhaustion. Additionally, in deployments where Tinyproxy is used for request-body inspection, filtering, or security enforcement, the unread body may be forwarded without proper inspection, resulting in potential security control bypass.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Vulnerability Title
Tinyproxy 安全漏洞
Vulnerability Description
Tinyproxy是Tinyproxy开源的一个小型、高效的 HTTP/SSL 代理守护程序。 Tinyproxy 1.11.3及之前版本存在安全漏洞，该漏洞源于HTTP请求解析不同步，可能导致拒绝服务或绕过安全检查。
CVSS Information
N/A
Vulnerability Type
N/A