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Gentoo Linux Security Advisory GLSA 201705-15 |
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https://security.gentoo.org/ |
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Severity: High |
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Title: sudo: Privilege escalation |
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Date: May 30, 2017 |
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Bugs: #620182 |
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ID: 201705-15 |
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Synopsis |
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======== |
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A vulnerability in sudo allows local users to gain root privileges. |
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Background |
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========== |
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|
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sudo (su "do") allows a system administrator to delegate authority to |
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give certain users (or groups of users) the ability to run some (or |
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all) commands as root or another user while providing an audit trail of |
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the commands and their arguments. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 app-admin/sudo < 1.8.20_p1 >= 1.8.20_p1 |
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|
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Description |
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=========== |
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|
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Qualys discovered a vulnerability in sudo's get_process_ttyname() for |
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Linux, that via sudo_ttyname_scan() can be directed to use a |
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user-controlled, arbitrary tty device during its traversal of "/dev" by |
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utilizing the world-writable /dev/shm. |
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Impact |
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====== |
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|
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A local attacker can pretend that his tty is any character device on |
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the filesystem, and after two race conditions, an attacker can pretend |
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that the controlled tty is any file on the filesystem allowing for |
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privilege escalation |
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All sudo users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=app-admin/sudo-1.8.20_p1" |
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References |
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========== |
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[ 1 ] CVE-2017-1000367 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-1000367 |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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https://security.gentoo.org/glsa/201705-15 |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users' machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2017 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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http://creativecommons.org/licenses/by-sa/2.5 |
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