Platform
openssl
Component
openssl
Fixed in
2.0.0
CVE-2016-7798 describes a critical vulnerability within the OpenSSL gem for Ruby. This flaw stems from the gem's improper handling of initialization vectors (IVs) when using Galois/Counter Mode (GCM) encryption. Attackers can exploit this weakness to bypass encryption protections, potentially compromising sensitive data. The vulnerability impacts OpenSSL versions up to and including 2.0.0.beta.2, and a fix is available in version 2.0.0.
The core of the vulnerability lies in the OpenSSL gem's GCM implementation. Specifically, the IV is initialized before the encryption key. This allows an attacker with contextual knowledge to predict or manipulate the IV, effectively rendering the encryption useless. The impact is significant: an attacker could decrypt sensitive data transmitted or stored using GCM encryption without needing to know the encryption key. This could include confidential communications, financial data, or personal information. While the vulnerability is specific to the Ruby OpenSSL gem, it highlights a broader concern about proper cryptographic implementation and IV management. A successful exploit could lead to data breaches and compromise system integrity.
CVE-2016-7798 was publicly disclosed in 2017. While no active exploitation campaigns have been definitively linked to this specific CVE, the underlying weakness in IV handling is a common source of cryptographic vulnerabilities. There are no known public proof-of-concept exploits readily available, but the theoretical possibility of exploitation remains. This CVE is not currently listed on the CISA KEV catalog. The NVD record was published on October 24, 2017.
Exploit Status
EPSS
0.79% (74% percentile)
CVSS Vector
The primary mitigation for CVE-2016-7798 is to upgrade the OpenSSL gem to version 2.0.0 or later. This version includes a corrected implementation that properly handles IV initialization. If upgrading is not immediately feasible, consider implementing stricter input validation and data sanitization to minimize the potential impact of compromised data. While not a direct fix, using a Web Application Firewall (WAF) with rules to detect and block suspicious GCM traffic can provide an additional layer of defense. Monitor OpenSSL logs for unusual activity related to GCM encryption. After upgrading, confirm the fix by attempting to reproduce the vulnerability using a known exploit pattern and verifying that the encryption remains secure.
No official patch available. Check for workarounds or monitor for updates.
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CVE-2016-7798 is a HIGH severity vulnerability affecting OpenSSL versions up to 2.0.0.beta.2. It allows attackers to bypass encryption in GCM mode due to improper IV handling, potentially exposing sensitive data.
If you are using OpenSSL versions 2.0.0.beta.2 or earlier in your Ruby applications, you are potentially affected by this vulnerability. Check your OpenSSL version using gem list openssl.
Upgrade the OpenSSL gem to version 2.0.0 or later using gem install openssl -v 2.0.0. This resolves the improper IV handling issue.
While no active exploitation campaigns have been definitively linked to this specific CVE, the underlying weakness remains a concern. Monitor your systems and applications for any suspicious activity.
Refer to the OpenSSL security advisory and the NVD entry for detailed information: https://nvd.nist.gov/vuln/detail/CVE-2016-7798
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