exploit the possibilities

Secunia Security Advisory 22816

Secunia Security Advisory 22816
Posted Nov 13, 2006
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Paul Szabo has reported some vulnerabilities in the Linux NetKit FTP Server, which can be exploited by malicious, local users to gain knowledge of potentially sensitive information, or perform certain actions with escalated privileges.

tags | advisory, local, vulnerability
systems | linux
MD5 | f38a22b5f9ecfd65b5186427e3491821

Secunia Security Advisory 22816

Change Mirror Download

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To improve our services to our customers, we have made a number of
additions to the Secunia Advisories and have started translating the
advisories to German.

The improvements will help our customers to get a better
understanding of how we reached our conclusions, how it was rated,
our thoughts on exploitation, attack vectors, and scenarios.

This includes:
* Reason for rating
* Extended description
* Extended solution
* Exploit code or links to exploit code
* Deep links

Read the full description:
http://corporate.secunia.com/products/48/?r=l

Contact Secunia Sales for more information:
http://corporate.secunia.com/how_to_buy/15/?r=l

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

TITLE:
Linux NetKit FTP Server Information Disclosure and Privilege
Escalation

SECUNIA ADVISORY ID:
SA22816

VERIFY ADVISORY:
http://secunia.com/advisories/22816/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information, Privilege escalation

WHERE:
Local system

SOFTWARE:
Linux NetKit FTP Server 0.x
http://secunia.com/product/12560/

DESCRIPTION:
Paul Szabo has reported some vulnerabilities in the Linux NetKit FTP
Server, which can be exploited by malicious, local users to gain
knowledge of potentially sensitive information, or perform certain
actions with escalated privileges.

1) The Linux NetKit FTP Server does not correctly drop privileges
before changing into certain directories. This can be exploited to
gain access to otherwise not accessible information and may allow to
gain escalated privileges via symlink attacks if a NFS filesystem is
used.

2) The return values of "seteuid()" and similar calls are not
correctly checked. This can be exploited to perform certain actions
with e.g. root privileges if the calls fail due to e.g. resource
limits.

SOLUTION:
Restrict access to trusted users only or use another product.

PROVIDED AND/OR DISCOVERED BY:
Paul Szabo

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2006-August/049014.html
http://www.gentoo.org/security/en/glsa/glsa-200611-05.xml

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

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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

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