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[ GLSA 200804-03 ] OpenSSH: Privilege escalation
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PostPosted: Sat Apr 05, 2008 1:26 pm    Post subject: [ GLSA 200804-03 ] OpenSSH: Privilege escalation Reply with quote

Gentoo Linux Security Advisory

Title: OpenSSH: Privilege escalation (GLSA 200804-03)
Severity: normal
Exploitable: local
Date: April 05, 2008
Bug(s): #214985, #215702
ID: 200804-03

Synopsis

Two flaws have been discovered in OpenSSH which could allow local attackers to escalate their privileges.

Background

OpenSSH is a complete SSH protocol implementation that includes an SFTP client and server support.

Affected Packages

Package: net-misc/openssh
Vulnerable: < 4.7_p1-r6
Unaffected: >= 4.7_p1-r6
Architectures: All supported architectures


Description

Two issues have been discovered in OpenSSH:
  • Timo Juhani Lindfors discovered that OpenSSH sets the DISPLAY variable in SSH sessions using X11 forwarding even when it cannot bind the X11 server to a local port in all address families (CVE-2008-1483).
  • OpenSSH will execute the contents of the ".ssh/rc" file even when the "ForceCommand" directive is enabled in the global sshd_config (CVE-2008-1657).


Impact

A local attacker could exploit the first vulnerability to hijack forwarded X11 sessions of other users and possibly execute code with their privileges, disclose sensitive data or cause a Denial of Service, by binding a local X11 server to a port using only one address family. The second vulnerability might allow local attackers to bypass intended security restrictions and execute commands other than those specified by "ForceCommand" if they are able to write to their home directory.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSH users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openssh-4.7_p1-r6"


References

CVE-2008-1483
CVE-2008-1657
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