CVE-2022-0778 vulnerability in OpenSSL and Other Products
Published on March 15, 2022
Infinite loop in BN_mod_sqrt() reachable when parsing certificates
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).
Products Associated with CVE-2022-0778
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2022-0778 are published in these products:
Affected Versions
OpenSSL:- Version Fixed in OpenSSL 3.0.2 (Affected 3.0.0,3.0.1) is affected.
- Version Fixed in OpenSSL 1.1.1n (Affected 1.1.1-1.1.1m) is affected.
- Version Fixed in OpenSSL 1.0.2zd (Affected 1.0.2-1.0.2zc) is affected.
- Before V2.17 is affected.
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- Before * is affected.
- Before V2.9.7 is affected.
- Before V2.9.7 is affected.
- Before V2.9.7 is affected.
- Before V2.9.7 is affected.
- Before V3.0.1 is affected.
- Before V3.0.1 is affected.
- Before V3.0.1 is affected.
- Before V3.0.1 is affected.
- Before V3.0.1 is affected.
- Before V2.4.8 is affected.
- Before V17 Update 5 is affected.
- Before * is affected.
- Before * is affected.
- Before V17 Update 5 is affected.
- Before V3.1.1 is affected.
- Before V1.0.8 is affected.
- Before * is affected.
- Before V2.3 is affected.
- Before V2.4.8 is affected.
- Version V3.1.0 and below V3.1.5 is affected.
- Version V3.1.0 and below V3.1.5 is affected.
- Version V3.1.0 and below V3.1.5 is affected.
- Version V3.1.0 and below V3.1.5 is affected.
- Version V3.1.0 and below V3.1.5 is affected.
Exploit Probability
EPSS
6.49%
Percentile
91.13%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.