RUSTSEC-2023-0010

Source

https://rustsec.org/advisories/RUSTSEC-2023-0010

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2023-0010.json

Aliases

Published

2023-02-07T12:00:00Z

Modified

2023-11-08T04:10:48.273182Z

Summary

Double free after calling `PEM_read_bio_ex`

Details

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.

References

Affected packages

crates.io / openssl-src

Package

Name: openssl-src

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Fixed

111.25.0

Introduced

300.0.0

Fixed

300.0.12

Ecosystem specific

{
    "affected_functions": null,
    "affects": {
        "os": [],
        "functions": [],
        "arch": []
    }
}

Database specific

{
    "cvss": null,
    "informational": null,
    "categories": [
        "denial-of-service"
    ]
}