RHSA-2012:0683
Vulnerability from csaf_redhat - Published: 2012-05-21 17:03 - Updated: 2025-11-21 17:40Summary
Red Hat Security Advisory: bind-dyndb-ldap security update
Notes
Topic
An updated bind-dyndb-ldap package that fixes one security issue is now
available for Red Hat Enterprise Linux 6.
The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.
Details
The dynamic LDAP back end is a plug-in for BIND that provides back-end
capabilities to LDAP databases. It features support for dynamic updates
and internal caching that help to reduce the load on LDAP servers.
A flaw was found in the way bind-dyndb-ldap handled LDAP query errors. If a
remote attacker were able to send DNS queries to a named server that is
configured to use bind-dyndb-ldap, they could trigger such an error with a
DNS query leveraging bind-dyndb-ldap's insufficient escaping of the LDAP
base DN (distinguished name). This would result in an invalid LDAP query
that named would retry in a loop, preventing it from responding to other
DNS queries. With this update, bind-dyndb-ldap only attempts to retry one
time when an LDAP search returns an unexpected error. (CVE-2012-2134)
Red Hat would like to thank Ronald van Zantvoort for reporting this issue.
All bind-dyndb-ldap users should upgrade to this updated package, which
contains a backported patch to correct this issue. For the update to take
effect, the named service must be restarted.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "The dynamic LDAP back end is a plug-in for BIND that provides back-end\ncapabilities to LDAP databases. It features support for dynamic updates\nand internal caching that help to reduce the load on LDAP servers.\n\nA flaw was found in the way bind-dyndb-ldap handled LDAP query errors. If a\nremote attacker were able to send DNS queries to a named server that is\nconfigured to use bind-dyndb-ldap, they could trigger such an error with a\nDNS query leveraging bind-dyndb-ldap\u0027s insufficient escaping of the LDAP\nbase DN (distinguished name). This would result in an invalid LDAP query\nthat named would retry in a loop, preventing it from responding to other\nDNS queries. With this update, bind-dyndb-ldap only attempts to retry one\ntime when an LDAP search returns an unexpected error. (CVE-2012-2134)\n\nRed Hat would like to thank Ronald van Zantvoort for reporting this issue.\n\nAll bind-dyndb-ldap users should upgrade to this updated package, which\ncontains a backported patch to correct this issue. For the update to take\neffect, the named service must be restarted.",
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"ids": [
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"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind-dyndb-ldap: Bind DoS (named hang) by processing DNS query for zone served by bind-dyndb-ldap",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2012-2134"
},
{
"category": "external",
"summary": "RHBZ#815846",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=815846"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2012-2134",
"url": "https://www.cve.org/CVERecord?id=CVE-2012-2134"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2012-2134",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2012-2134"
}
],
"release_date": "2012-04-24T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2012-05-21T17:03:00+00:00",
"details": "Before applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/knowledge/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2012:0683"
}
],
"scores": [
{
"cvss_v2": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.3,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "bind-dyndb-ldap: Bind DoS (named hang) by processing DNS query for zone served by bind-dyndb-ldap"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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