high
8.1
CWE
193
Advisory Published
CVE Published
Updated

CVE-2021-23017

First published: Fri May 21 2021(Updated: )

A flaw was found in nginx. An off-by-one error while processing DNS responses allows a network attacker to write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least significant byte of next heap chunk metadata likely leading to a remote code execution in certain circumstances. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Credit: f5sirt@f5.com

Affected SoftwareAffected VersionHow to fix
F5 Nginx>=0.6.18<1.20.1
Openresty Openresty<1.19.3.2
Fedoraproject Fedora=33
Fedoraproject Fedora=34
NetApp ONTAP Select Deploy administration utility
Oracle Blockchain Platform<21.1.2
Oracle Communications Control Plane Monitor=3.4
Oracle Communications Control Plane Monitor=4.2
Oracle Communications Control Plane Monitor=4.3
Oracle Communications Control Plane Monitor=4.4
Oracle Communications Fraud Monitor>=3.4<=4.4
Oracle Communications Operations Monitor=3.4
Oracle Communications Operations Monitor=4.2
Oracle Communications Operations Monitor=4.3
Oracle Communications Operations Monitor=4.4
Oracle Communications Session Border Controller=8.4
Oracle Communications Session Border Controller=9.0
Oracle Enterprise Communications Broker=3.3.0
Oracle Enterprise Session Border Controller=8.4
Oracle Enterprise Session Border Controller=9.0
Oracle Enterprise Telephony Fraud Monitor=3.4
Oracle Enterprise Telephony Fraud Monitor=4.2
Oracle Enterprise Telephony Fraud Monitor=4.3
Oracle Enterprise Telephony Fraud Monitor=4.4
Oracle GoldenGate<21.4.0.0.0
redhat/automation-hub<0:4.2.5-1.el7
0:4.2.5-1.el7
redhat/python-galaxy-ng<0:4.2.5-2.el7
0:4.2.5-2.el7
redhat/python-pulpcore<0:3.7.6-1.el7
0:3.7.6-1.el7
redhat/automation-hub<0:4.2.5-1.el8
0:4.2.5-1.el8
redhat/python-galaxy-ng<0:4.2.5-2.el8
0:4.2.5-2.el8
redhat/python-pulpcore<0:3.7.6-1.el8
0:3.7.6-1.el8
redhat/rh-nginx118-nginx<1:1.18.0-3.el7
1:1.18.0-3.el7
redhat/rh-nginx116-nginx<1:1.16.1-6.el7
1:1.16.1-6.el7

Remedy

http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html

Remedy

https://www.oracle.com/security-alerts/cpuapr2022.html

Remedy

https://www.oracle.com/security-alerts/cpujan2022.html

Remedy

https://www.oracle.com/security-alerts/cpuoct2021.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this security issue in nginx resolver?

    The vulnerability ID for this security issue in nginx resolver is CVE-2021-23017.

  • What is the severity of CVE-2021-23017?

    The severity of CVE-2021-23017 is high with a CVSS score of 8.1.

  • How does the vulnerability in nginx resolver occur?

    The vulnerability in nginx resolver is caused by an off-by-one error while processing DNS responses.

  • What is the potential impact of this vulnerability?

    The potential impact of this vulnerability is remote code execution.

  • How can I fix the vulnerability in nginx resolver?

    To fix the vulnerability in nginx resolver, update to version 1.21.0 or 1.20.1 of nginx.

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