medium
5.9
CWE
327
Advisory Published
CVE Published
Updated

CVE-2021-23839: Incorrect SSLv2 rollback protection

First published: Tue Feb 16 2021(Updated: )

OpenSSL could provide weaker than expected security, caused by incorrect SSLv2 rollback protection that allows for the inversion of the logic during a padding check. If the server is configured for SSLv2 support at compile time, configured for SSLv2 support at runtime or configured for SSLv2 ciphersuites, it will accept a connection if a version rollback attack has occurred and erroneously reject a connection if a normal SSLv2 connection attempt is made.

Credit: openssl-security@openssl.org openssl-security@openssl.org

Affected SoftwareAffected VersionHow to fix
OpenSSL OpenSSL>=1.0.2s<=1.0.2x
Oracle Business Intelligence=5.5.0.0.0
Oracle Business Intelligence=5.9.0.0.0
Oracle Business Intelligence=12.2.1.3.0
Oracle Business Intelligence=12.2.1.4.0
Oracle Enterprise Manager For Storage Management=13.4.0.0
Oracle Enterprise Manager Ops Center=12.4.0.0
Oracle GraalVM=19.3.5
Oracle GraalVM=20.3.1.2
Oracle GraalVM=21.0.0.2
Oracle Jd Edwards World Security=a9.4
Oracle ZFS Storage Appliance Kit=8.8
Siemens Sinec Ins<1.0
Siemens Sinec Ins=1.0
Siemens Sinec Ins=1.0-sp1
redhat/openssl<1.1.1
1.1.1
redhat/openssl<1.0.2
1.0.2
IBM EWM<=7.0.1
IBM RTC<=6.0.6.1
IBM EWM<=7.0
IBM RTC<=6.0.6
IBM EWM<=7.0.2
IBM DOORS Next<=7.0.2
IBM DOORS Next<=7.0
IBM DOORS Next<=7.0.1
IBM RDNG<=6.0.6.1
IBM RDNG<=6.0.6
IBM Engineering Requirements Quality Assistant On-Premises<=All
IBM RELM<=6.0.6.1
IBM ENI<=7.0.1
IBM RELM<=6.0.6
IBM ENI<=7.0
IBM RELM<=6.0.2
IBM ENI<=7.0.2
IBM RQM<=6.0.6.1
IBM ETM<=7.0.1
IBM RQM<=6.0.6
IBM ETM<=7.0.0
IBM ETM<=7.0.2
IBM CLM<=6.0.6.1
IBM CLM<=6.0.6
IBM ELM<=7.0
IBM CLM<=6.0.2
IBM ELM<=7.0.1
IBM ELM<=7.0.2

Remedy

https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf

Remedy

https://www.oracle.com//security-alerts/cpujul2021.html

Remedy

https://www.oracle.com/security-alerts/cpuApr2021.html

Remedy

https://www.oracle.com/security-alerts/cpuapr2022.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 OpenSSL vulnerability?

    The vulnerability ID for this OpenSSL vulnerability is CVE-2021-23839.

  • What is the severity of CVE-2021-23839?

    The severity of CVE-2021-23839 is medium.

  • Which software versions are affected by CVE-2021-23839?

    Software versions 1.0.2 and 1.1.1 of OpenSSL are affected by CVE-2021-23839.

  • How can I fix the OpenSSL vulnerability with CVE-2021-23839?

    To fix the OpenSSL vulnerability with CVE-2021-23839, update to version 1.1.1 of OpenSSL.

  • Are there any references for additional information about CVE-2021-23839?

    Yes, you can find more information about CVE-2021-23839 at the following references: [Reference 1](https://www.openssl.org/news/secadv/20210216.txt), [Reference 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1930318), [Reference 3](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1930317).

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