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TITLE:
OpenLDAP "krbv4_ldap_auth()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA23334

VERIFY ADVISORY:
http://secunia.com/advisories/23334/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
OpenLDAP 2.1.x
http://secunia.com/product/1831/
OpenLDAP 2.2.x
http://secunia.com/product/5319/
OpenLDAP 2.3.x
http://secunia.com/product/5943/

DESCRIPTION:
Solar Eclipse has reported a vulnerability in OpenLDAP, which can be
exploited by malicious people to potentially compromise a vulnerable
system.

The vulnerability is caused due to a boundary error within the
"krbv4_ldap_auth()" function in servers/slapd/kerberos.c and can be
exploited to cause a stack based buffer overflow by sending a
specially crafted bind request with more than 1250 bytes of
credential data.

Successful exploitation may allow the execution of arbitrary code,
but requires that OpenLDAP is compiled with the "--enable-kbind"
option (not enabled by default since version 2.0.2 and removed from
the configure script since version 2.1).

SOLUTION:
Don't use OpenLDAP compiled with the "--enable-kbind" option.

PROVIDED AND/OR DISCOVERED BY:
Solar Eclipse

ORIGINAL ADVISORY:
http://www.phreedom.org/solar/exploits/openldap-kbind/

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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http://secunia.com/about_secunia_advisories/


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