TITLE:
Fedora Directory Server LDAP Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA18960

VERIFY ADVISORY:
http://secunia.com/advisories/18960/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

SOFTWARE:
Fedora Directory Server 1.x
http://secunia.com/product/8160/

DESCRIPTION:
Evgeny Legerov has reported some vulnerabilities in Fedora Directory
Server, which can be exploited by malicious people to cause a DoS
(Denial of Service).

1) Memory leaks in the LDAP component when processing BER packets can
be exploited to exhaust available memory resources via specially
crafted BER packets.

2) An error in the LDAP component within the dn2ancestor code can be
exploited to exhaust available CPU and memory resources via a DN
containing a large amount of "," (comma) characters.

3) An error in the LDAP component when processing BER packets can be
exploited to crash the service via a specially crafted BER sequence.

The vulnerabilities have been reported in version 1.0. Other versions
may also be affected.

SOLUTION:
Restrict access to the LDAP service.

PROVIDED AND/OR DISCOVERED BY:
Evgeny Legerov

ORIGINAL ADVISORY:
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=179135
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=179137

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