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Debian: DSA-3440-1 Urgent Security Issue: Sudo Access Control Flaw

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 . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- 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 - ------------------------------------------------------------------------- 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/ Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. . Debian Security Advisory DSA-3441-1: nginx exposes sensitive data. Immediate upgrade is essential for protection!. Sudo Security, File Access Control, Debian Update. . Severity: Critical. LinuxSecurity.com Team

Jan 11, 2016 •Critical Debian