The OpenSSL Project warned of a ‘high-severity’ security vulnerability in the TLS/SSL toolkit that exposes users to denial-of-service (DoS) attacks.
The flaw is a null pointer dereference, successful exploitation could trigger denial-of-service conditions. The vulnerability was reported by Google researcher David Benjamin.
“The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not.” reads the alert published by OpenSSL Project. “This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack.”
The flaw stems from the GENERAL_NAME_cmp function which compares different instances of a GENERAL_NAME using in X.509 certificates.
The GENERAL_NAME_cmp function is used for the following purposes:
1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate
2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token)
An attacker could trigger a clash by controlling both items being compared, this is possible, for example, if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL.
The flaw affects all OpenSSL 1.1.1 and 1.0.2 versions, users are urged to upgrade to OpenSSL 1.1.1i.
[adrotate banner=”9″] | [adrotate banner=”12″] |
(SecurityAffairs – hacking, DoS)
[adrotate banner=”5″]
[adrotate banner=”13″]
Cisco addressed multiple vulnerabilities in IOS and IOS XE software that can be exploited to…
Google's Threat Analysis Group (TAG) and Mandiant reported a surge in the number of actively…
Google addressed two zero-day vulnerabilities in the Chrome web browser that have been demonstrated during…
The INC Ransom extortion group hacked the National Health Service (NHS) of Scotland and is threatening…
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds a Microsoft SharePoint vulnerability disclosed at the…
This is the advantage of Data Detection and Response (DDR) for organizations aiming to build…
This website uses cookies.