[gentoo-announce] [ GLSA 200804-16 ] rsync: Execution of arbitrary code

[news 28]

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Gentoo Linux Security Advisory GLSA 200804-16

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http://security.gentoo.org/

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Severity: High

Title: rsync: Execution of arbitrary code

Date: April 17, 2008

Bugs: #216887

ID: 200804-16

 

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Synopsis

========

 

A buffer overflow in rsync might lead to the remote execution of

arbitrary code when extended attributes are being used.

 

Background

==========

 

rsync is a file transfer program to keep remote directories

synchronized.

 

Affected packages

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

 

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

Package / Vulnerable / Unaffected

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

1 net-misc/rsync < 2.6.9-r6 >= 2.6.9-r6

 

Description

===========

 

Sebastian Krahmer of SUSE reported an integer overflow in the

expand_item_list() function in the file util.c which might lead to a

heap-based buffer overflow when extended attribute (xattr) support is

enabled.

 

Impact

======

 

A remote attacker could send a file containing specially crafted

extended attributes to an rsync deamon, or entice a user to sync from

an rsync server containing specially crafted files, possibly leading to

the execution of arbitrary code.

 

Please note that extended attributes are only enabled when USE="acl" is

enabled, which is the default setting.

 

Workaround

==========

 

Disable extended attributes in the rsync daemon by setting "refuse

options = xattrs" in the file "/etc/rsyncd.conf" (or append "xattrs" to

an existing "refuse" statement). When synchronizing to a server, do not

provide the "-X" parameter to rsync. You can also disable the "acl" USE

flag for rsync and recompile the package.

 

Resolution

==========

 

All rsync users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=net-misc/rsync-2.6.9-r6"

 

References

==========

 

[ 1 ] CVE-2008-1720

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1720

 

Availability

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

 

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

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200804-16.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 ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2008 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