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[ GLSA 201401-23 ] sudo: Privilege escalation
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PostPosted: Sat Jan 25, 2014 4:19 am    Post subject: [ GLSA 201401-23 ] sudo: Privilege escalation Reply with quote

Gentoo Linux Security Advisory

Title: sudo: Privilege escalation (GLSA 201401-23)
Severity: high
Exploitable: local
Date: January 21, 2014
Bug(s): #459722
ID: 201401-23

Synopsis

Multiple vulnerabilities have been found in sudo which could result
in privilege escalation.


Background

sudo allows a system administrator to give users the ability to run
commands as other users. Access to commands may also be granted on a
range to hosts.


Affected Packages

Package: app-admin/sudo
Vulnerable: < 1.8.6_p7
Unaffected: >= 1.8.6_p7
Architectures: All supported architectures


Description

Multiple vulnerabilities have been found in sudo:
  • sudo does not correctly validate the controlling terminal on a system
    without /proc or when the tty_tickets option is enabled.
  • sudo does not properly handle the clock when it is set to the epoch.


Impact

A local attacker with sudo privileges could connect to the stdin,
stdout, and stderr of the terminal of a user who has authenticated with
sudo, allowing the attacker to hijack the authorization of the other
user. Additionally, a local or physically proximate attacker could set
the system clock to the epoch, bypassing time restrictions on sudo
authentication.


Workaround

There is no known workaround at this time.

Resolution

All sudo users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=app-admin/sudo-1.8.6_p7"
   


References

CVE-2013-1775
CVE-2013-1776
CVE-2013-2776
CVE-2013-2777
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