GLSA 201801-05: OpenSSH: Permission issue

Severity:normal
Title:OpenSSH: Permission issue
Date:01/07/2018
Bugs: #633428
ID:201801-05

Synopsis

A flaw has been discovered in OpenSSH which could allow a remote attacker to create zero-length files.

Background

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

Affected packages

Package Vulnerable Unaffected Architecture(s)
net-misc/openssh < 7.5_p1-r3 >= 7.5_p1-r3 All supported architectures

Description

The process_open function in sftp-server.c in OpenSSH did not properly prevent write operations in readonly mode.

Impact

A remote attacker could cause the creation of zero-length files.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSH users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=net-misc/openssh-7.5_p1-r3"
    

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201801-05.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

License

Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

Thank you!