The Qualys Research Labs reported a flaw in Exim, a mail transport agent. Improper validation of the recipient address in the deliver_message() function may result in the execution of arbitrary commands.

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Debian Security Advisory DSA-4456-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
June 05, 2019                         https://www.debian.org/security/faq
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Package        : exim4
CVE ID         : CVE-2019-10149

The Qualys Research Labs reported a flaw in Exim, a mail transport
agent. Improper validation of the recipient address in the
deliver_message() function may result in the execution of arbitrary
commands.

For the stable distribution (stretch), this problem has been fixed in
version 4.89-2+deb9u4.

We recommend that you upgrade your exim4 packages.

For the detailed security status of exim4 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/exim4

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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