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.
References
Link | Resource |
---|---|
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=63bcf189be73a9cc1264059bed6f57974be74a83 | Patch Vendor Advisory |
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=bbcf509bd046b34cca19c766bbddc31683d0858b | Patch Vendor Advisory |
https://security.gentoo.org/glsa/202402-08 | |
https://www.openssl.org/news/secadv/20230207.txt | Vendor Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: openssl
Published: 2023-02-08T19:04:04.874Z
Updated: 2023-02-24T14:53:33.164Z
Reserved: 2022-12-13T13:38:08.598Z
Link: CVE-2022-4450
JSON object: View
NVD Information
Status : Modified
Published: 2023-02-08T20:15:23.973
Modified: 2024-02-04T09:15:08.733
Link: CVE-2022-4450
JSON object: View
Redhat Information
No data.
CWE