OpenSSH: Security bypass

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/openssh	< 4.7	>= 4.7	All supported architectures

Related bugreports: #191321

A flaw has been discovered in OpenSSH which could allow a local attacker to bypass security restrictions.

2. Impact Information

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

Jan Pechanec discovered that OpenSSH uses a trusted X11 cookie when it cannot create an untrusted one.

An attacker could bypass the SSH client security policy and gain privileges by causing an X client to be treated as trusted.

3. Resolution Information

There is no known workaround at this time.

All OpenSSH users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openssh-4.7"

4. References

Updated November 01, 2007

Summary: This is a Gentoo Linux Security Advisory

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