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CVE-2015-1793 is a high-severity improper certificate validation vulnerability in OpenSSL's X509_verify_cert function. OpenSSL versions 1.0.1n through 1.0.1o and 1.0.2b through 1.0.2c incorrectly processed X.509 Basic Constraints cA values while constructing alternative certificate chains after an initial chain-building attempt failed. This could cause an untrusted certificate to be treated as trusted despite failing CA-related validation, allowing a valid end-entity certificate to be used as though it were a Certification Authority.
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What an attacker gets, and what they’ve been doing with it.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single Metasploit auxiliary module: 'OpenSSL Alternative Chains Certificate Forgery MITM Proxy'. The module exploits CVE-2015-1793, a logic flaw in OpenSSL's certificate chain verification, by acting as a man-in-the-middle (MITM) proxy. It forges a certificate chain using a valid leaf certificate (with specific key usage properties) to impersonate a server, allowing the attacker to intercept and record SSL/TLS application data between a client and a target server. The module requires the attacker to supply the necessary certificates and keys, and to be able to intercept traffic between the client and server. The code is written in Ruby and is designed to be run within the Metasploit Framework. The main entry point is the provided Ruby file, which sets up the proxy, handles certificate chain creation, and manages the MITM session. The exploit is operational and can be used to demonstrate or leverage the vulnerability in affected OpenSSL versions.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability referenced as an example in discussion of OpenSSL security severity levels.
OpenSSL certificate validation bypass vulnerability allowing a valid leaf certificate to be abused as a CA in alternative chain processing.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.