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Date: Wed, 3 Mar 2010 13:58:45 -0800
From: Kees Cook <>
Subject: CVE Request: libesmtp does not check NULL bytes in commonName


I just noticed that libesmtp does not appear to handle NULL-byte CNs, as
seen with the original browser-based issue:

Related to this are failures in wildcard handling:
and CN-specificity:

Though it may be a non-issue if TLS doesn't function at all:


Kees Cook
Ubuntu Security Team

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