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Gentoo Linux Security Advisory GLSA 201801-05

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https://security.gentoo.org/

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Severity: Normal

Title: OpenSSH: Permission issue

Date: January 07, 2018

Bugs: #633428

ID: 201801-05

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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

-------------------------------------------------------------------

1 net-misc/openssh < 7.5_p1-r3 >= 7.5_p1-r3

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

==========

[ 1 ] CVE-2017-15906

https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-15906

Availability

============

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

https://security.gentoo.org/glsa/201801-05

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 2018 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.

http://creativecommons.org/licenses/by-sa/2.5