Thursday, April 18, 2024

OpenSSL Flaw Would Allow Attackers to Cause a denial-of-service Condition

OpenSSL has released a Security Advisory [on 8th of December 2020] regarding the vulnerability CVE-2020-1971 which is called EDIPARTYNAME NULL pointer de-reference.

What is the vulnerability?

X.509 digital certificate’s GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName.

OpenSSL’s function GENERAL_NAME_cmp compares different instances of a GENERAL_NAME to see if they are equal or not.

It is found that this operation malfunctions when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer de-reference and a crash may occur leading to a possible denial of service attack which is illustrated in gbhackers.

Risk assignment:

If an attacker controls the functions of the GENERAL_NAME_cmp, he can crash the entire system.

This GENERAL_NAME_cmp is used for the below two main purposes:

1) GENERAL_NAME_cmp compares the CRL distribution point names between an available CRL and a CRL (where CRL is the Certificate Revocation list)distribution point embedded in an X509 certificate

2) GENERAL_NAME_cmp verifies whether a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token)

Suppose if the attacker tricks a client machine or a server machine to check for a malicious certificate against a malicious CRL, then Attacker can exploit this and cause denial of service attack . It is also to be noted that some applications automatically download CRLs based on a URL embedded in a certificate. OpenSSL’s s_server, s_client and verify tools have support for the “-crl_download” option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools.

Affected versions:

  • OpenSSL 1.1.1 and 1.0.2
  • This is not yet tested on the unsupported versions yet

Proposed advise:

  • OpenSSL 1.1.1 users are advised to upgrade to 1.1.1i with immediate effect.
  • Premium support customers of OpenSSL 1.0.2 have been asked to upgrade to 1.0.2x also other users are requested to upgrade to OpenSSL 1.1.1i right away.
Website

Latest articles

Xiid SealedTunnel: Unfazed by Yet Another Critical Firewall Vulnerability (CVE-2024-3400)

In the wake of the recent disclosure of a critical vulnerability (CVE-2024-3400) affecting a...

Cerber Linux Ransomware Exploits Atlassian Servers to Take Full Control

Security researchers at Cado Security Labs have uncovered a new variant of the Cerber...

FGVulDet – New Vulnerability Detector to Analyze Source Code

Detecting source code vulnerabilities aims to protect software systems from attacks by identifying inherent...

North Korean Hackers Abuse DMARC To Legitimize Their Emails

DMARC is targeted by hackers as this serves to act as a preventative measure...

L00KUPRU Ransomware Attackers discovered in the wild

A new variant of the Xorist ransomware, dubbed L00KUPRU, has been discovered in the...

Oracle Releases Biggest Security Update in 2024 – 372 Vulnerabilities Are Fixed – Update Now!

Oracle has released its April 2024 Critical Patch Update (CPU), addressing 372 security vulnerabilities...

Outlook Login Panel Themed Phishing Attack Evaded All Antivirus Detections

Cybersecurity researchers have uncovered a new phishing attack that has bypassed all antivirus detections.The...
Guru baran
Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

WAAP/WAF ROI Analysis

Mastering WAAP/WAF ROI Analysis

As the importance of compliance and safeguarding critical websites and APIs grows, Web Application and API Protection (WAAP) solutions play an integral role.
Key takeaways include:

  • Pricing models
  • Cost Estimation
  • ROI Calculation

Related Articles