7.5 High
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
6.8 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
47.0%
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. The OpenSSL asn1parse command line application is also impacted by this issue.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | openssl | <Β 3.0.8-1 | openssl_3.0.8-1_all.deb |
Debian | 11 | all | openssl | <Β 1.1.1n-0+deb11u4 | openssl_1.1.1n-0+deb11u4_all.deb |
Debian | 10 | all | openssl | <Β 1.1.1n-0+deb10u4 | openssl_1.1.1n-0+deb10u4_all.deb |
Debian | 999 | all | openssl | <Β 3.0.8-1 | openssl_3.0.8-1_all.deb |
Debian | 13 | all | openssl | <Β 3.0.8-1 | openssl_3.0.8-1_all.deb |
7.5 High
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
6.8 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
47.0%