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Sun Java System Directory Server 5.2 Uninitialized Pointer Cleanup Design Error Vulnerability



Sun Java System Directory Server is an LDAP server distributed by Sun with multiple products. More information is available at the following URL.



Remote exploitation of a design error vulnerability in Sun Microsystems Inc.'s Java System Directory Server 5.2 may cause a denial of service (DoS) condition.

Due to a design error in the clean-up code following certain types of failed queries, it is possible to cause the server to call the free() function on an address obtained from uninitialized memory. This can result in an invalid memory reference leading to denial of service.


Exploitation of this vulnerability allows remote attackers to cause a denial of service against the affected server, 'ns-slapd'.

In some situations it may be possible to put information from the remote attacker in the memory range being accessed which may allow execution of code, however this has not yet been demonstrated.


iDefense has confirmed Sun Java System Directory Server 5.2 Directory Server 5.2 2005Q4 is affected by this vulnerability. Previous versions are also suspected to be vulnerable.


Restrict remote access at the network boundary, unless remote parties require service. Access to the affected host should be filtered at the network boundary if global accessibility is not required. Restricting access to only trusted hosts and networks may reduce the likelihood of exploitation.


Sun Microsystems Inc. has addressed this issue in Sun Java System Directory Server 5.2 Patch5. For more information see Sun Alert ID 102853 by visiting the URL shown below.



The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-4175 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.


08/16/2006 Initial vendor notification
08/21/2006 Initial vendor response
03/23/2007 Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2007 Verisign, Inc.

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