The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload data. If the function succeeds then the "name_out", "header" and "data" arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: openssl

Published: 2023-02-08T19:04:04.874Z

Updated: 2024-08-03T01:41:44.632Z

Reserved: 2022-12-13T13:38:08.598Z

Link: CVE-2022-4450

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-02-08T20:15:23.973

Modified: 2024-11-21T07:35:17.197

Link: CVE-2022-4450

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-02-07T00:00:00Z

Links: CVE-2022-4450 - Bugzilla