CVE Vulnerabilities

CVE-2021-22901

This vulnerability is marked as RESERVED by NVD. This means that the CVE-ID is reserved for future use by the CVE Numbering Authority (CNA) or a security researcher, but the details of it are not yet publicly available yet.

This page will reflect the classification results once they are available through NVD.

Any vendor information available is shown as below.

Redhat

CVE-2021-22901 curl: Use-after-free in TLS session handling when using OpenSSL TLS backend

Affected Software List

NameVendorVersion
JBoss Core Services for RHEL 8RedHat
JBoss Core Services on RHEL 7RedHat
Red Hat JBoss Core Services 1RedHat

Ubuntu

curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.

Affected Software List

NameVendorVersion
CurlUbuntu/xenialout of standard support
CurlUbuntu/trustyout of standard support
CurlUbuntu/upstream7.77.0