漏洞信息
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Vulnerability Title
Libevent: HTTP header handling bugs create risk of access control bypass.
Vulnerability Description
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has two HTTP parsing weaknesses in http.c. evhttp_decode_uri_internal decodes percent-encoded %00 bytes into literal NUL characters, which can cause downstream C string operations to truncate a path and bypass validation performed on a different representation. evhttp_header_is_valid_value also accepts obsolete line folding in header values containing carriage return or line feed characters, allowing a proxy and libevent to interpret headers differently and enabling header injection or access control bypass. The CRLF header acceptance is fixed in versions 2.1.13 and 2.2.2-alpha, but the reviewed patches do not clearly remediate the URI NUL-truncation condition.
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http.c文件中的evhttp_decode_uri_internal函数将百分号编码的%00字节解码为NUL字符,导致路径被截断并绕过验证,以及evhttp_header_is_valid_value函数接受包含回车或换行符的头值,可能导致头部注入或访问控制绕过。
CVSS Information
N/A
Vulnerability Type
N/A