Vulnerabilities > CVE-2021-4044 - Infinite Loop vulnerability in multiple products

CVSS 7.5 - HIGH

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

NONE

Availability impact

HIGH

network

low complexity

NVD

Published: 2021-12-14

Updated: 2024-11-21

Summary

Internally libssl in OpenSSL calls X509_verify_cert() on the client side to verify a certificate supplied by a server. That function may return a negative return value to indicate an internal error (for example out of memory). Such a negative return value is mishandled by OpenSSL and will cause an IO function (such as SSL_connect() or SSL_do_handshake()) to not indicate success and a subsequent call to SSL_get_error() to return the value SSL_ERROR_WANT_RETRY_VERIFY. This return value is only supposed to be returned by OpenSSL if the application has previously called SSL_CTX_set_cert_verify_callback(). Since most applications do not do this the SSL_ERROR_WANT_RETRY_VERIFY return value from SSL_get_error() will be totally unexpected and applications may not behave correctly as a result. The exact behaviour will depend on the application but it could result in crashes, infinite loops or other similar incorrect responses. This issue is made more serious in combination with a separate bug in OpenSSL 3.0 that will cause X509_verify_cert() to indicate an internal error when processing a certificate chain. This will occur where a certificate does not include the Subject Alternative Name extension but where a Certificate Authority has enforced name constraints. This issue can occur even with valid chains. By combining the two issues an attacker could induce incorrect, application dependent behaviour. Fixed in OpenSSL 3.0.1 (Affected 3.0.0).

Vulnerable Configurations

Part	Description	Count
Application	Openssl Openssl Openssl 1.1.0 Openssl Openssl - Openssl Openssl 0.9.1C Openssl Openssl 0.9.2B Openssl Openssl 0.9.3 Openssl Openssl 0.9.3A Openssl Openssl 0.9.4 Openssl Openssl 0.9.5 Openssl Openssl 0.9.5A Openssl Openssl 0.9.6 Openssl Openssl 0.9.6A Openssl Openssl 0.9.6B Openssl Openssl 0.9.6C Openssl Openssl 0.9.6D Openssl Openssl 0.9.6E Openssl Openssl 0.9.6F Openssl Openssl 0.9.6G Openssl Openssl 0.9.6H Openssl Openssl 0.9.6I Openssl Openssl 0.9.6J Openssl Openssl 0.9.6K Openssl Openssl 0.9.6L Openssl Openssl 0.9.6M Openssl Openssl 0.9.7 Openssl Openssl 0.9.7A Openssl Openssl 0.9.7B Openssl Openssl 0.9.7C Openssl Openssl 0.9.7D Openssl Openssl 0.9.7E Openssl Openssl 0.9.7F Openssl Openssl 0.9.7G Openssl Openssl 0.9.7H Openssl Openssl 0.9.7I Openssl Openssl 0.9.7J Openssl Openssl 0.9.7K Openssl Openssl 0.9.7L Openssl Openssl 0.9.7M Openssl Openssl 0.9.8 Openssl Openssl 0.9.8A Openssl Openssl 0.9.8B Openssl Openssl 0.9.8C Openssl Openssl 0.9.8C-1 Openssl Openssl 0.9.8D Openssl Openssl 0.9.8E Openssl Openssl 0.9.8F Openssl Openssl 0.9.8G Openssl Openssl 0.9.8G-9 Openssl Openssl 0.9.8H Openssl Openssl 0.9.8I Openssl Openssl 0.9.8J Openssl Openssl 0.9.8K Openssl Openssl 0.9.8L Openssl Openssl 0.9.8M Openssl Openssl 0.9.8N Openssl Openssl 0.9.8O Openssl Openssl 0.9.8P Openssl Openssl 0.9.8Q Openssl Openssl 0.9.8R Openssl Openssl 0.9.8S Openssl Openssl 0.9.8T Openssl Openssl 0.9.8U Openssl Openssl 0.9.8V Openssl Openssl 0.9.8W Openssl Openssl 0.9.8X Openssl Openssl 0.9.8Y Openssl Openssl 0.9.8Z Openssl Openssl 0.9.8Za Openssl Openssl 0.9.8Zb Openssl Openssl 0.9.8Zc Openssl Openssl 0.9.8Zd Openssl Openssl 0.9.8Ze Openssl Openssl 0.9.8Zf Openssl Openssl 0.9.8Zg Openssl Openssl 0.9.8Zh Openssl Openssl 1.0.0 Openssl Openssl 1.0.0A Openssl Openssl 1.0.0B Openssl Openssl 1.0.0C Openssl Openssl 1.0.0D Openssl Openssl 1.0.0E Openssl Openssl 1.0.0F Openssl Openssl 1.0.0G Openssl Openssl 1.0.0H Openssl Openssl 1.0.0I Openssl Openssl 1.0.0J Openssl Openssl 1.0.0K Openssl Openssl 1.0.0L Openssl Openssl 1.0.0M Openssl Openssl 1.0.0N Openssl Openssl 1.0.0O Openssl Openssl 1.0.0P Openssl Openssl 1.0.0Q Openssl Openssl 1.0.0R Openssl Openssl 1.0.0S Openssl Openssl 1.0.0T Openssl Openssl 1.0.1 Openssl Openssl 1.0.1A Openssl Openssl 1.0.1B Openssl Openssl 1.0.1C Openssl Openssl 1.0.1D Openssl Openssl 1.0.1E Openssl Openssl 1.0.1F Openssl Openssl 1.0.1G Openssl Openssl 1.0.1H Openssl Openssl 1.0.1I Openssl Openssl 1.0.1J Openssl Openssl 1.0.1K Openssl Openssl 1.0.1L Openssl Openssl 1.0.1M Openssl Openssl 1.0.1N Openssl Openssl 1.0.1O Openssl Openssl 1.0.1P Openssl Openssl 1.0.1Q Openssl Openssl 1.0.1R Openssl Openssl 1.0.1S Openssl Openssl 1.0.1T Openssl Openssl 1.0.1U Openssl Openssl 1.0.2 Openssl Openssl 3.0.0	168
Application	Netapp Netapp Cloud Backup - Netapp Snapcenter - Netapp Ontap Select Deploy Administration Utility - Netapp E Series Performance Analyzer -	4
Application	Nodejs Nodejs Node.Js 17.0.0 Nodejs Node.Js 17.0.1 Nodejs Node.Js 17.1.0 Nodejs Node.Js 17.2.0	4
OS	Netapp Netapp A250 Firmware - Netapp 500F Firmware - Netapp H500S Firmware - Netapp H700S Firmware - Netapp H300E Firmware - Netapp H500E Firmware - Netapp H700E Firmware - Netapp H410S Firmware - Netapp H410C Firmware - Netapp H300S Firmware -	10
Hardware	Netapp Netapp A250 - Netapp 500F - Netapp H500S - Netapp H700S - Netapp H300E - Netapp H500E - Netapp H700E - Netapp H410S - Netapp H410C - Netapp H300S -	10

Common Weakness Enumeration (CWE)

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Summary

Vulnerable Configurations

Common Weakness Enumeration (CWE)

References