Off-by-one error in the UTF8StringNormalize function in OpenLDAP 2.4.26 and earlier allows remote attackers to cause a denial of service (slapd crash) via a zero-length string that triggers a heap-based buffer overflow, as demonstrated using an empty postalAddressAttribute value in an LDIF entry.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Off-by-one error in the UTF8StringNormalize function in OpenLDAP 2.4.26 and earlier allows remote
    attackers to cause a denial of service (slapd crash) via a zero-length string that triggers a heap-based
    buffer overflow, as demonstrated using an empty postalAddressAttribute value in an LDIF entry.
    (CVE-2011-4079)

The remote host is affected by the vulnerability described in GLSA-201406-36 (OpenLDAP: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in OpenLDAP. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker might employ a specially crafted certificate to       conduct man-in-the-middle attacks on SSL connections made using OpenLDAP,       bypass security restrictions or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

It was discovered that slapd contained an off-by-one error. An authenticated attacker could potentially exploit this by sending a crafted crafted LDIF entry containing an empty postalAddress.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
401306	Alpine: libldap, multiple openldap packages: security update to 2.4.26-r2 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	high
401306	Alpine: libldap, multiple openldap packages: security update to 2.4.26-r2 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
76331	GLSA-201406-36 : OpenLDAP: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
56869	Ubuntu 10.04 LTS / 10.10 / 11.04 / 11.10 : openldap vulnerability (USN-1266-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2011-4079

high

Tenable Plugins

high

high

medium

medium