Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openssl | Openssl | >= 1.1.1, < 1.1.1t |
| Stormshield | Stormshield Network Security | >= 4.0.0, < 4.3.16 |
Related Weaknesses (CWE)
References
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=63bcf189be73a9cc126PatchVendor Advisory
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=bbcf509bd046b34cca1PatchVendor Advisory
- https://security.gentoo.org/glsa/202402-08
- https://www.openssl.org/news/secadv/20230207.txtVendor Advisory
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=63bcf189be73a9cc126PatchVendor Advisory
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=bbcf509bd046b34cca1PatchVendor Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0003
- https://security.gentoo.org/glsa/202402-08
- https://www.openssl.org/news/secadv/20230207.txtVendor Advisory
FAQ
What is CVE-2022-4450?
CVE-2022-4450 is a vulnerability with a CVSS score of 7.5 (HIGH). 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", "...
How severe is CVE-2022-4450?
CVE-2022-4450 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-4450?
Check the references section above for vendor advisories and patch information. Affected products include: Openssl Openssl, Stormshield Stormshield Network Security.