The update for the shadow suite issued as DSA-3793-1 introduced a regression in su signal handling. If su receives a signal like SIGTERM, it is not propagated to the child. Updated packages are now available to correct this issue.

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Debian Security Advisory DSA-3793-2                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
May 17, 2017                          https://www.debian.org/security/faq
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Package        : shadow
Debian Bug     : 862806

The update for the shadow suite issued as DSA-3793-1 introduced a
regression in su signal handling. If su receives a signal like SIGTERM,
it is not propagated to the child. Updated packages are now available to
correct this issue.

For the stable distribution (jessie), this problem has been fixed in
version 1:4.2-3+deb8u4.

We recommend that you upgrade your shadow packages.

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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