Select your cookie preferences

We use cookies and similar tools to enhance your experience, provide our services, deliver relevant advertising, and make improvements. Approved third parties also use these tools to help us deliver advertising and provide certain site features.

CVE-2022-0778

Public on 2022-03-15
Modified on 2023-06-09
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). (CVE-2022-0778)

Severity
Important
See what this means
CVSS v3 Base Score
7.5
See breakdown
Continue reading

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Aws-nitro-enclaves-cli Extra aws-nitro-enclaves-acm 2022-04-25 16:22 ALAS2NITRO-ENCLAVES-2022-018
Amazon Linux 2 - Mariadb10.5 Extra mariadb 2023-08-21 21:00 ALAS2MARIADB10.5-2023-003
Amazon Linux 2023 mariadb105 2023-02-17 20:44 ALAS2023-2023-037
Amazon Linux 1 openssl 2022-03-15 18:54 ALAS-2022-1575
Amazon Linux 2 - Core openssl 2022-03-15 18:49 ALAS2-2022-1766
Amazon Linux 2023 openssl 2023-02-17 20:45 ALAS2023-2023-051
Amazon Linux 2 - Core openssl11 2022-03-15 18:49 ALAS2-2022-1766
Amazon Linux 2 - Core edk2 2024-03-13 20:26 ALAS2-2024-2502

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv2 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
NVD CVSSv3 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H