CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
52.1%
The function PEM_read_bio_ex()
reads a PEM file from a BIO and parses and decodes the βnameβ (e.g. βCERTIFICATEβ), any header data and the payload data. If the function succeeds then the βname_outβ, βheaderβ and βdataβ 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.
Vendor | Product | Version | CPE |
---|---|---|---|
* | openssl-src | * | cpe:2.3:a:*:openssl-src:*:*:*:*:*:*:*:* |
git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=63bcf189be73a9cc1264059bed6f57974be74a83
git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=bbcf509bd046b34cca19c766bbddc31683d0858b
github.com/advisories/GHSA-v5w6-wcm8-jm4q
nvd.nist.gov/vuln/detail/CVE-2022-4450
rustsec.org/advisories/RUSTSEC-2023-0010.html
security.gentoo.org/glsa/202402-08
www.openssl.org/news/secadv/20230207.txt