Authen::DigestMD5 versions 0.01 through 0.04 for Perl generate the cnonce insecurely

Authen::DigestMD5 versions 0.01 through 0.02 for Perl generate the cnonce insecurely. The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. According to RFC 2831, "The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy."

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可预测问题

Authen::DigestMD5 安全漏洞

Authen::DigestMD5是Perl社区的一个Perl语言中的模块。 Authen::DigestMD5 0.01至0.02版本存在安全漏洞，该漏洞源于cnonce生成不安全。

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