Description
The handle_connection_error function in ldap_helper.c in bind-dyndb-ldap before 1.1.0rc1 does not properly handle LDAP query errors, which allows remote attackers to cause a denial of service (infinite loop and named server hang) via a non-alphabet character in the base DN in an LDAP search DNS query.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | bind-dyndb-ldap | 0.2.0-7.el6_2.1 | RHSA-2012:0683 |
Advisories 1
- RHSA-2012:0683 Red Hat Security Advisory: bind-dyndb-ldap security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 48901 third-party-advisory
- [Freeipa-users] 20120424 named-dyndb-ldap looses connection when the LDAP server is under high load mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=815846
- https://git.fedorahosted.org/cgit/bind-dyndb-ldap.git/tree/NEWS
- RHSA-2012:0683 vendor-advisory
- 81619 vdb-entry
- [oss-security] 20140424 Re: CVE Request -- bind-dyndb-ldap: Bind DoS (named hang) by processing DNS query for zone served by bind-dyndb-ldap mailing-list