When sudo is configured to allow a user to edit files under a directory that they can already write to without using sudo, they can actually edit (read and write) arbitrary files. Daniel Svartman reported that a configuration like this might be introduced unintentionally if the

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Debian Security Advisory DSA-3440-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                            Ben Hutchings
January 11, 2016                      https://www.debian.org/security/faq
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Package        : sudo
CVE ID         : CVE-2015-5602
Debian Bug     : 804149

When sudo is configured to allow a user to edit files under a directory
that they can already write to without using sudo, they can actually
edit (read and write) arbitrary files. Daniel Svartman reported that a
configuration like this might be introduced unintentionally if the
editable files are specified using wildcards, for example:

    operator ALL=(root) sudoedit /home/*/*/test.txt

The default behaviour of sudo has been changed so that it does not allow
editing of a file in a directory that the user can write to, or that is
reached by following a symlink in a directory that the user can write
to. These restrictions can be disabled, but this is strongly
discouraged.

For the oldstable distribution (wheezy), this problem has been fixed
in version 1.8.5p2-1+nmu3+deb7u1.

For the stable distribution (jessie), this problem has been fixed in
version 1.8.10p3-1+deb8u3.

For the testing distribution (stretch), this problem has been fixed
in version 1.8.15-1.1.

For the unstable distribution (sid), this problem has been fixed in
version 1.8.15-1.1.

We recommend that you upgrade your sudo 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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