CVE-2022-4450

CVSS V2 None CVSS V3 None
Description
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.
Overview
  • CVE ID
  • CVE-2022-4450
  • Assigner
  • openssl-security@openssl.org
  • Vulnerability Status
  • Modified
  • Published Version
  • 2023-02-08T20:15:23
  • Last Modified Date
  • 2023-02-24T15:15:12
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* 1 OR 1.1.1 1.1.1t
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* 1 OR 3.0.0 3.0.8
History
Created Old Value New Value Data Type Notes
2023-04-17 07:24:41 Added to TrackCVE
2023-04-17 07:24:42 Weakness Enumeration new