OpenSSL 1.0.2-1.0.2zc, 1.1.1-1.1.1m, 3.0.0-3.0.1 - Denial of Service via BN_mod_sqrt Infinite Loop
Title source: llmExploitation Summary
EIP tracks 6 public exploits for CVE-2022-0778. PoCs published by drago-96, jkakavas, yywing.
AI-analyzed exploit summary This repository contains a working proof-of-concept for CVE-2022-0778, which exploits an infinite loop vulnerability in OpenSSL's BN_mod_sqrt() function. The exploit crafts a malicious X.509 certificate with non-prime curve parameters to trigger a DoS condition.
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).
Exploits (6)
This repository contains a working proof-of-concept for CVE-2022-0778, which exploits an infinite loop vulnerability in OpenSSL's BN_mod_sqrt() function. The exploit crafts a malicious X.509 certificate with non-prime curve parameters to trigger a DoS condition.
This PoC exploits CVE-2022-0778 by injecting a crafted certificate during a TLS handshake to trigger a DoS in vulnerable OpenSSL servers. It overrides the `TLSConnection._clientKeyExchange` method to send a maliciously crafted certificate in response to a CertificateRequest.
This repository contains a proof-of-concept exploit for CVE-2022-0778, a vulnerability in the Go TLS library related to certificate handling. The exploit demonstrates a malicious client sending a specially crafted certificate to a vulnerable server, potentially causing a denial-of-service or other impacts.
This repository provides a description and credits for CVE-2022-0778, a vulnerability related to SSL certificates causing DoS (CPU 100% or reboot). It references external PoCs but does not contain exploit code itself.
This repository provides a detailed writeup and analysis of CVE-2022-0778, an infinite loop vulnerability in OpenSSL's BN_mod_sqrt() function, leading to a Denial of Service (DoS) condition. It includes pre-patch and post-patch code comparisons, environment setup instructions, and references.
The repository contains configuration files and documentation for OpenSSL, specifically targeting CVE-2022-0778. It includes build configurations, templates, and helper scripts but lacks actual exploit code or proof-of-concept implementation.
References (34)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H