Red Hat has acknowledged a security issue and some vulnerabilities in Red Hat Certificate System, which can be exploited by malicious people to conduct spoofing attacks and malicious users and malicious people to bypass certain security features.
1) The certificate authority does not properly restrict certain SCEP calls to authenticated registration authorities, which can be exploited to e.g. decrypt a sniffed one-time PIN.
2) The certificate authority does not properly prevent one-time PINs from being used multiple times in enrollment requests, which can be exploited to e.g. generate an unlimited amount of certificates.
Successful exploitation requires a valid enrollment one-time PIN.
3) The certificate authority uses the MD5 cryptographic hash function to sign SCEP responses, which can be exploited to facilitate spoofing via collision attacks.
Solution: Updated packages are available via Red Hat Network.
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Subject: Red Hat Certificate Server MD5 and SCEP Vulnerabilities
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