An OpenLDAP security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.
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Ubuntu Security Notice USN-4724-1
February 08, 2021
openldap vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in OpenLDAP.
Software Description:
- openldap: Lightweight Directory Access Protocol
Details:
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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.10:
slapd 2.4.53+dfsg-1ubuntu1.3
Ubuntu 20.04 LTS:
slapd 2.4.49+dfsg-2ubuntu1.6
Ubuntu 18.04 LTS:
slapd 2.4.45+dfsg-1ubuntu1.9
Ubuntu 16.04 LTS:
slapd 2.4.42+dfsg-2ubuntu3.12
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4724-1
CVE-2020-36221, CVE-2020-36222, CVE-2020-36223, CVE-2020-36224,
CVE-2020-36225, CVE-2020-36226, CVE-2020-36227, CVE-2020-36228,
CVE-2020-36229, CVE-2020-36230
Package Information:
https://launchpad.net/ubuntu/+source/openldap/2.4.53+dfsg-1ubuntu1.3
https://launchpad.net/ubuntu/+source/openldap/2.4.49+dfsg-2ubuntu1.6
https://launchpad.net/ubuntu/+source/openldap/2.4.45+dfsg-1ubuntu1.9
https://launchpad.net/ubuntu/+source/openldap/2.4.42+dfsg-2ubuntu3.12