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37 lines
1.8 KiB
Markdown
37 lines
1.8 KiB
Markdown
```toml
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[advisory]
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id = "RUSTSEC-2023-0010"
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package = "openssl-src"
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aliases = ["CVE-2022-4450", "GHSA-v5w6-wcm8-jm4q"]
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categories = ["denial-of-service"]
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date = "2023-02-07"
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url = "https://www.openssl.org/news/secadv/20230207.txt"
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[versions]
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patched = [">= 111.25, < 300.0", ">= 300.0.12"]
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```
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# Double free after calling `PEM_read_bio_ex`
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The function `PEM_read_bio_ex()` reads a PEM file from a BIO and parses and
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decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload data.
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If the function succeeds then the "name_out", "header" and "data" arguments are
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populated with pointers to buffers containing the relevant decoded data. The
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caller is responsible for freeing those buffers. It is possible to construct a
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PEM file that results in 0 bytes of payload data. In this case `PEM_read_bio_ex()`
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will return a failure code but will populate the header argument with a pointer
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to a buffer that has already been freed. If the caller also frees this buffer
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then a double free will occur. This will most likely lead to a crash. This
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could be exploited by an attacker who has the ability to supply malicious PEM
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files for parsing to achieve a denial of service attack.
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The functions `PEM_read_bio()` and `PEM_read()` are simple wrappers around
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`PEM_read_bio_ex()` and therefore these functions are also directly affected.
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These functions are also called indirectly by a number of other OpenSSL
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functions including `PEM_X509_INFO_read_bio_ex()` and
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`SSL_CTX_use_serverinfo_file()` which are also vulnerable. Some OpenSSL internal
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uses of these functions are not vulnerable because the caller does not free the
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header argument if `PEM_read_bio_ex()` returns a failure code. These locations
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include the `PEM_read_bio_TYPE()` functions as well as the decoders introduced in
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OpenSSL 3.0.
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