CVE-2022-4450

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.

Database specific

{
    "cna_assigner": "openssl",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/4xxx/CVE-2022-4450.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "3.0.0"
                        },
                        {
                            "fixed": "3.0.8"
                        },
                        {
                            "introduced": "1.1.1"
                        },
                        {
                            "fixed": "1.1.1t"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                }
            ]
        }
    ]
}

References

Affected packages

Git / github.com/kzalewski/openssl-1.1.1

Affected ranges

Type

GIT

Repo

https://github.com/kzalewski/openssl-1.1.1

Events

Introduced

9ad69b994ae7c73ba06d9f75efd2625102de814c

Fixed

9ad69b994ae7c73ba06d9f75efd2625102de814c

Database specific

Show details

{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.1.1"
                },
                {
                    "fixed": "1.1.1t"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-4450.json"

Git / github.com/openssl/openssl

Affected ranges

Type

GIT

Repo

https://github.com/openssl/openssl

Events

Introduced

e04bd3433fd84e1861bf258ea37928d9845e6a86

Fixed

e04bd3433fd84e1861bf258ea37928d9845e6a86

Introduced

89cd17a031e022211684eb7eb41190cf1910f9fa

Fixed

31157bc0b46e04227b8468d3e6915e4d0332777c

Database specific

Show details

{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.1.1"
                },
                {
                    "fixed": "1.1.1t"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.0.0"
                },
                {
                    "fixed": "3.0.8"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}

Affected versions

openssl-3.*

openssl-3.0.0

openssl-3.0.1

openssl-3.0.2

openssl-3.0.3

openssl-3.0.4

openssl-3.0.5

openssl-3.0.6

openssl-3.0.7

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-4450.json"