Vulnerability identifier: #VU50740
Vulnerability risk: Medium
CVSSv3.1:
CVE-ID:
CWE-ID:
Exploitation vector: Network
Exploit availability:
Vulnerable software:
OpenSSL
Server applications /
Encryption software
Vendor: OpenSSL Software Foundation
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the X509_issuer_and_serial_hash() function when parsing the issuer field in the X509 certificate. A remote attacker can supply a specially crafted certificate, trigger a NULL pointer dereference error and perform a denial of service (DoS) attack.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
OpenSSL: 1.1.1 - 1.1.1i, 1.1.0 - 1.1.0l, 1.0.2 - 1.0.2x, 1.0.1 - 1.0.1u, 1.0.0 - 1.0.0t
Fixed software versions
CPE
External links
http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1
http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2
http://www.openssl.org/news/secadv/20210216.txt
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?