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CVE-2022-0778

HIGHCVSS 7.5/10EPSS 70.56%

Last modified

CVE-2022-0778 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The BN_mod_sqrt() function, which computes a modular square root, contains a bug that can cause it to loop forever for non-prime moduli. Internally this function is used when parsing certificates that contain elliptic curve public keys in compressed form or explicit elliptic curve parameters with a base point encoded in compressed form. EPSS estimates a 70.56% chance of exploitation in the next 30 days.

Description

The BN_mod_sqrt() function, which computes a modular square root, contains a bug that can cause it to loop forever for non-prime moduli. Internally this function is used when parsing certificates that contain elliptic curve public keys in compressed form or explicit elliptic curve parameters with a base point encoded in compressed form. It is possible to trigger the infinite loop by crafting a certificate that has invalid explicit curve parameters. Since certificate parsing happens prior to verification of the certificate signature, any process that parses an externally supplied certificate may thus be subject to a denial of service attack. The infinite loop can also be reached when parsing crafted private keys as they can contain explicit elliptic curve parameters. Thus vulnerable situations include: - TLS clients consuming server certificates - TLS servers consuming client certificates - Hosting providers taking certificates or private keys from customers - Certificate authorities parsing certification requests from subscribers - Anything else which parses ASN.1 elliptic curve parameters Also any other applications that use the BN_mod_sqrt() where the attacker can control the parameter values are vulnerable to this DoS issue. In the OpenSSL 1.0.2 version the public key is not parsed during initial parsing of the certificate which makes it slightly harder to trigger the infinite loop. However any operation which requires the public key from the certificate will trigger the infinite loop. In particular the attacker can use a self-signed certificate to trigger the loop during verification of the certificate signature. This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0. It was addressed in the releases of 1.1.1n and 3.0.2 on the 15th March 2022. Fixed in OpenSSL 3.0.2 (Affected 3.0.0,3.0.1). Fixed in OpenSSL 1.1.1n (Affected 1.1.1-1.1.1m). Fixed in OpenSSL 1.0.2zd (Affected 1.0.2-1.0.2zc).

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
70.56%

99.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
OpensslOpenssl>= 1.0.2, < 1.0.2zd
OpensslOpenssl>= 1.1.0, < 1.1.1n
OpensslOpenssl>= 3.0.0, < 3.0.2
DebianDebian Linux9.0
DebianDebian Linux10.0
DebianDebian Linux11.0
NetappCloud Volumes Ontap MediatorAll versions
NetappClustered Data OntapAll versions
NetappClustered Data Ontap Antivirus ConnectorAll versions
NetappSantricity Smi-S ProviderAll versions
NetappStoragegridAll versions
NetappA250 FirmwareAll versions
Netapp500f FirmwareAll versions
FedoraprojectFedora34
FedoraprojectFedora36
TenableNessus< 8.15.4
TenableNessus>= 10.0.0, < 10.1.2
MariadbMariadb>= 10.2.0, < 10.2.42
MariadbMariadb>= 10.3.0, < 10.3.33
MariadbMariadb>= 10.4.0, < 10.4.23
MariadbMariadb>= 10.5.0, < 10.5.14
MariadbMariadb>= 10.6.0, < 10.6.6
MariadbMariadb>= 10.7.0, < 10.7.2
NodejsNode.Js>= 12.0.0, <= 12.12.0
NodejsNode.Js>= 12.13.0, < 12.22.11
NodejsNode.Js> 14.0.0, <= 14.14.0
NodejsNode.Js>= 14.15.0, < 14.19.1
NodejsNode.Js> 16.0.0, <= 16.12.0
NodejsNode.Js>= 16.13.0, < 16.14.2
NodejsNode.Js> 17.0.0, < 17.7.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2022-0778?
The BN_mod_sqrt() function, which computes a modular square root, contains a bug that can cause it to loop forever for non-prime moduli. Internally this function is used when parsing certificates that contain elliptic curve public keys in compressed form or explicit elliptic curve parameters with a base point encoded in compressed form. It is possible to trigger the infinite loop by crafting a certificate that has invalid explicit curve parameters. Since certificate parsing happens prior to verification of the certificate signature, any process that parses an externally supplied certificate may thus be subject to a denial of service attack. The infinite loop can also be reached when parsing crafted private keys as they can contain explicit elliptic curve parameters. Thus vulnerable situations include: - TLS clients consuming server certificates - TLS servers consuming client certificates - Hosting providers taking certificates or private keys from customers - Certificate authorities parsing certification requests from subscribers - Anything else which parses ASN.1 elliptic curve parameters Also any other applications that use the BN_mod_sqrt() where the attacker can control the parameter values are vulnerable to this DoS issue. In the OpenSSL 1.0.2 version the public key is not parsed during initial parsing of the certificate which makes it slightly harder to trigger the infinite loop. However any operation which requires the public key from the certificate will trigger the infinite loop. In particular the attacker can use a self-signed certificate to trigger the loop during verification of the certificate signature. This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0. It was addressed in the releases of 1.1.1n and 3.0.2 on the 15th March 2022. Fixed in OpenSSL 3.0.2 (Affected 3.0.0,3.0.1). Fixed in OpenSSL 1.1.1n (Affected 1.1.1-1.1.1m). Fixed in OpenSSL 1.0.2zd (Affected 1.0.2-1.0.2zc).
How severe is CVE-2022-0778?
CVE-2022-0778 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 70.56% probability of exploitation in the next 30 days.
How do I fix CVE-2022-0778?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-0778?

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Source: NVD / NIST