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AUSCERT External Security Bulletin Redistribution
USN-4724-1: OpenLDAP vulnerabilities
9 February 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2020-36230 CVE-2020-36229 CVE-2020-36228
CVE-2020-36227 CVE-2020-36226 CVE-2020-36225
CVE-2020-36224 CVE-2020-36223 CVE-2020-36222
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USN-4724-1: OpenLDAP vulnerabilities
08 February 2021
Several security issues were fixed in OpenLDAP.
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o openldap - Lightweight Directory Access Protocol
It was discovered that OpenLDAP incorrectly handled Certificate Exact
Assertion processing. A remote attacker could possibly use this issue to
cause OpenLDAP to crash, resulting in a denial of service. ( CVE-2020-36221 )
It was discovered that OpenLDAP incorrectly handled saslAuthzTo processing.
A remote attacker could use this issue to cause OpenLDAP to crash,
resulting in a denial of service, or possibly execute arbitrary code.
( CVE-2020-36222 , CVE-2020-36224 , CVE-2020-36225 , CVE-2020-36226 )
It was discovered that OpenLDAP incorrectly handled Return Filter control
handling. A remote attacker could use this issue to cause OpenLDAP to
crash, resulting in a denial of service, or possibly execute arbitrary
code. ( CVE-2020-36223 )
It was discovered that OpenLDAP incorrectly handled certain cancel
operations. A remote attacker could possibly use this issue to cause
OpenLDAP to crash, resulting in a denial of service. ( CVE-2020-36227 )
It was discovered that OpenLDAP incorrectly handled Certificate List
Extract Assertion processing. A remote attacker could possibly use this
issue to cause OpenLDAP to crash, resulting in a denial of service.
( CVE-2020-36228 )
It was discovered that OpenLDAP incorrectly handled X.509 DN parsing. A
remote attacker could possibly use this issue to cause OpenLDAP to crash,
resulting in a denial of service. ( CVE-2020-36229 , CVE-2020-36230 )
The problem can be corrected by updating your system to the following package
o slapd - 2.4.53+dfsg-1ubuntu1.3
o slapd - 2.4.49+dfsg-2ubuntu1.6
o slapd - 2.4.45+dfsg-1ubuntu1.9
o slapd - 2.4.42+dfsg-2ubuntu3.12
In general, a standard system update will make all the necessary changes.
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