Two vulnerabilities have been reported in Exim, which potentially can be exploited by malicious people to compromise a vulnerable system.
1) A format string error exists within the "dkim_exim_verify_finish()" function in src/dkim.c when handling DKIM signatures containing format string specifiers, which can be exploited to e.g. cause a crash or memory corruption by sending emails with a specially crafted "DKIM-Signature:" header.
2) An error related to the handling of certain DKIM signatures can be exploited to execute arbitrary code.
The vulnerabilities are reported in versions 4.70 through 4.75.
Solution: Update to version 4.76.
Provided and/or discovered by: 1) John Levine
2) Reported by the vendor.
Original Advisory: http://bugs.exim.org/show_bug.cgi?id=1106
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Subject: Exim DKIM Two Vulnerabilities
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