cve-2022-4450
Vulnerability from cvelistv5
Published
2023-02-08 19:04
Modified
2024-08-03 01:41
Severity ?
Summary
Double free after calling PEM_read_bio_ex
Impacted products
OpenSSLOpenSSL
Show details on NVD website


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          "value": "Marc Sch\u00f6nefeld"
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              "value": "The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and\u003cbr\u003edecodes the \"name\" (e.g. \"CERTIFICATE\"), any header data and the payload data.\u003cbr\u003eIf the function succeeds then the \"name_out\", \"header\" and \"data\" arguments are\u003cbr\u003epopulated with pointers to buffers containing the relevant decoded data. The\u003cbr\u003ecaller is responsible for freeing those buffers. It is possible to construct a\u003cbr\u003ePEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex()\u003cbr\u003ewill return a failure code but will populate the header argument with a pointer\u003cbr\u003eto a buffer that has already been freed. If the caller also frees this buffer\u003cbr\u003ethen a double free will occur. This will most likely lead to a crash. This\u003cbr\u003ecould be exploited by an attacker who has the ability to supply malicious PEM\u003cbr\u003efiles for parsing to achieve a denial of service attack.\u003cbr\u003e\u003cbr\u003eThe functions PEM_read_bio() and PEM_read() are simple wrappers around\u003cbr\u003ePEM_read_bio_ex() and therefore these functions are also directly affected.\u003cbr\u003e\u003cbr\u003eThese functions are also called indirectly by a number of other OpenSSL\u003cbr\u003efunctions including PEM_X509_INFO_read_bio_ex() and\u003cbr\u003eSSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal\u003cbr\u003euses of these functions are not vulnerable because the caller does not free the\u003cbr\u003eheader argument if PEM_read_bio_ex() returns a failure code. These locations\u003cbr\u003einclude the PEM_read_bio_TYPE() functions as well as the decoders introduced in\u003cbr\u003eOpenSSL 3.0.\u003cbr\u003e\u003cbr\u003e\u003cdiv\u003eThe OpenSSL asn1parse command line application is also impacted by this issue.\u003c/div\u003e\u003cbr\u003e"
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