Vulnerability identifier: #VU42929

Vulnerability risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-2777

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Sudo
Client/Desktop applications / Software for system administration

Vendor: Sudo

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

sudo before 1.7.10p5 and 1.8.x before 1.8.6p6, when the tty_tickets option is enabled, does not properly validate the controlling terminal device, which allows local users with sudo permissions to hijack the authorization of another terminal via vectors related to a session without a controlling terminal device and connecting to the standard input, output, and error file descriptors of another terminal. NOTE: this is one of three closely-related vulnerabilities that were originally assigned CVE-2013-1776, but they have been SPLIT because of different affected versions.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Sudo: 1.3.5 - 1.8.6p5

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External links
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=701839
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://rhn.redhat.com/errata/RHSA-2013-1701.html
http://www.debian.org/security/2013/dsa-2642
http://www.openwall.com/lists/oss-security/2013/02/27/31
http://www.securityfocus.com/bid/58207
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2013&m=slackware-security.517440
http://www.sudo.ws/repos/sudo/rev/2f3225a2a4a4
http://www.sudo.ws/repos/sudo/rev/bfa23f089bba
http://www.sudo.ws/sudo/alerts/tty_tickets.html
http://bugs.launchpad.net/ubuntu/+source/sudo/+bug/87023
http://bugzilla.redhat.com/show_bug.cgi?id=916365
http://exchange.xforce.ibmcloud.com/vulnerabilities/82453
http://support.apple.com/kb/HT205031

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.