漏洞信息
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Vulnerability Title
libevent evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling
Vulnerability Description
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/SA:N
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Vulnerability Title
Libevent 输入验证错误漏洞
Vulnerability Description
Libevent是libevent组织的一个提供事件通知机制的网络开发库。 Libevent 2.1.13之前版本和2.2.2-alpha之前版本存在输入验证错误漏洞,该漏洞源于Libevent evhttp解析器在处理重复的Transfer-Encoding头、逗号分隔的Transfer-Encoding值和块传输中的裸换行时存在不一致,可能导致未经身份验证的远程攻击者解同步请求边界并走私第二个请求,从而绕过访问控制或污染缓存。
CVSS Information
N/A
Vulnerability Type
N/A