Vulnerability CVE-2022-4450: Information
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.
Severity: HIGH (7.5) Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| openssl1.1 | sisyphus | 1.1.1t-alt1 | 1.1.1w-alt1 | ALT-PU-2023-1195-1 | 314824 | Fixed |
| openssl1.1 | sisyphus_e2k | 1.1.1t-alt1 | 1.1.1w-alt1 | ALT-PU-2023-2502-1 | - | Fixed |
| openssl1.1 | sisyphus_riscv64 | 1.1.1t-alt1 | 1.1.1w-alt1 | ALT-PU-2023-2484-1 | - | Fixed |
| openssl1.1 | p10 | 1.1.1t-alt1 | 1.1.1w-alt0.p10.1 | ALT-PU-2023-1228-1 | 314825 | Fixed |
| openssl1.1 | p10_e2k | 1.1.1t-alt1 | 1.1.1w-alt0.p10.1 | ALT-PU-2023-2543-1 | - | Fixed |
| openssl1.1 | p9 | 1.1.1t-alt1 | 1.1.1u-alt1 | ALT-PU-2023-1299-1 | 314826 | Fixed |
| openssl1.1 | p9_e2k | 1.1.1t-alt1 | 1.1.1u-alt1 | ALT-PU-2023-2672-1 | - | Fixed |
| openssl1.1 | c10f1 | 1.1.1t-alt1 | 1.1.1w-alt0.p10.1 | ALT-PU-2023-1228-1 | 314825 | Fixed |
| openssl1.1 | c9f2 | 1.1.1t-alt1 | 1.1.1w-alt0.p9.1 | ALT-PU-2023-1360-1 | 314827 | Fixed |