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CVE-2020-1967

Null pointer deference in openssl-src

Impact

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).

Affected packages

EcosystemPackageAffectedFixed in
rustopenssl-src>= 111.6.0, < 111.9.0111.9.0

Affected products

VendorProductAffected versions
OpensslOpenssl
from 1.1.1d through 1.1.1f
DebianDebian Linux
Versions 9.0, 10.0
FreebsdFreebsd
Version 12.1
FedoraprojectFedora
Versions 30, 31, 32
OracleApplication Server
Version 12.1.3
OracleEnterprise Manager Base Platform
Version 13.4.0.0
OracleEnterprise Manager For Storage Management
Versions 13.3.0.0, 13.4.0.0
OracleEnterprise Manager Ops Center
Version 12.4.0
OracleHttp Server
Version 12.2.1.4.0
OracleJd Edwards World Security
Version a9.4
OracleMysql
through 5.6.48
from 5.7.0 through 5.7.30
from 8.0.0 through 8.0.20
OracleMysql Connectors
through 8.0.20

Weakness classification

CWE-476

References