Date: Sun, 13 Oct 2002 14:43:50 +0200
From: Daniel Ahlberg <aliz@gentoo.org>
To: bugtraq@securityfocus.com
Subject: GLSA: nss_ldap
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GENTOO LINUX SECURITY ANNOUNCEMENT
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PACKAGE ═ ═ ═ ═:nss_ldap
SUMMARY ═ ═ ═ ═:Buffer overflow
DATE ═ ═ ═ ═ ═ :2002-10-13 12:45 UTC
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Buffer overflow in the DNS SRV code for nss_ldap before nss_ldap-198
allows remote attackers to cause a denial of service and possibly
execute arbitrary code.
DETAIL
When versions of nss_ldap prior to nss_ldap-198 are configured
without a value for the "host" setting, nss_ldap will attempt to
configure itself by using SRV records stored in DNS. When parsing the
results of the DNS query, nss_ldap does not check that the data
returned by the server willfit into an internal buffer, leaving it
vulnerable to a buffer overflow. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2002-0825
to this issue.
When versions of nss_ldap prior to nss_ldap-199 are configured
without a value for the "host" setting, nss_ldap will attempt to
configure itself by using SRV records stored in DNS. When parsing
the results of the DNS query, nss_ldap does not check that the data
returned has not been truncated by the resolver libraries to avoid a
buffer overflow, and may attempt to parse more data than is actually
available, leaving it vulnerable to a read buffer overflow.
SOLUTION
It is recommended that all Gentoo Linux users who are running
net-libs/nss_ldap-174-r2 and earlier update their systems
as follows:
emerge rsync
emerge nss_ldap
emerge clean
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aliz@gentoo.org - GnuPG key is available at www.gentoo.org/~aliz
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