Vulnerability identifier: #VU61391

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2022-0778

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: Yes

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 infinite loop within the BN_mod_sqrt() function when processing an ASN.1 certificate that contains elliptic curve public keys in compressed form or explicit elliptic curve parameters with a base point encoded in compressed form. A remote attacker can supply a specially crafted certificate to the TLS server or client, consume all available system resources and cause denial of service conditions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 3.0.0 - 3.0.1, 1.1.1 - 1.1.1m, 1.0.2 - 1.0.2zc, 1.0.1 - 1.0.1u, 1.0.0 - 1.0.0t

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CPE

• cpe:2.3:a:openssl_software_foundation:openssl:3.0.1:*:*:*:*:*:*:*

External links
http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=380085481c64de749a6dd25cdf0bcf4360b30f83
http://www.openssl.org/news/secadv/20220315.txt
http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=a466912611aa6cbdf550cd10601390e587451246
http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=3118eb64934499d93db3230748a452351d1d9a65

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?