Debian Linux Security Advisory 1985-1 - It was discovered that sendmail, a Mail Transport Agent, does not properly handle a '\\0' character in a Common Name (CN) field of an X.509 certificate. This allows an attacker to spoof arbitrary SSL-based SMTP servers via a crafted server certificate issued by a legitimate Certification Authority, and to bypass intended access restrictions via a crafted client certificate issued by a legitimate Certification Authority.
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