CVE-2022-4450 (GCVE-0-2022-4450)

Vulnerability from cvelistv5 – Published: 2023-02-08 19:04 – Updated: 2025-11-04 19:14
VLAI
Title
Double free after calling PEM_read_bio_ex
Summary
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. The OpenSSL asn1parse command line application is also impacted by this issue.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:26 UTC
CWE
  • double-free
  • CWE-415 - Double Free
Assigner
References
Impacted products
Vendor Product Version CPE status
OpenSSL OpenSSL Affected: 3.0.0 , < 3.0.8 (semver)
Affected: 1.1.1 , < 1.1.1t (custom)
guessed Create a notification for this product.
Date Public
2023-02-07 00:00
Credits
CarpetFuzz Dawei Wang Marc Schönefeld Kurt Roeckx Matt Caswell
Show details on NVD website
To clipboard 

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                "url": "https://security.gentoo.org/glsa/202402-08"
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              {
                "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0003"
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            ],
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                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
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                  "version": "3.1"
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                    "id": "CVE-2022-4450",
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                "descriptions": [
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                    "cweId": "CWE-415",
                    "description": "CWE-415 Double Free",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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            "title": "CISA ADP Vulnrichment"
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              "defaultStatus": "unaffected",
              "product": "OpenSSL",
              "vendor": "OpenSSL",
              "versions": [
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                  "status": "affected",
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          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "user": "00000000-0000-4000-9000-000000000000",
              "value": "CarpetFuzz"
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            {
              "lang": "en",
              "type": "reporter",
              "user": "00000000-0000-4000-9000-000000000000",
              "value": "Dawei Wang"
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            {
              "lang": "en",
              "type": "reporter",
              "user": "00000000-0000-4000-9000-000000000000",
              "value": "Marc Sch\u00f6nefeld"
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              "lang": "en",
              "type": "remediation developer",
              "user": "00000000-0000-4000-9000-000000000000",
              "value": "Kurt Roeckx"
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              "lang": "en",
              "type": "remediation developer",
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          "datePublic": "2023-02-07T00:00:00.000Z",
          "descriptions": [
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              "lang": "en",
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                  "type": "text/html",
                  "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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              "other": {
                "content": {
                  "text": "Moderate"
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                "type": "https://www.openssl.org/policies/secpolicy.html"
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              "name": "OpenSSL Advisory",
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              "url": "https://www.openssl.org/news/secadv/20230207.txt"
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            },
            {
              "url": "https://security.gentoo.org/glsa/202402-08"
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          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Double free after calling PEM_read_bio_ex",
          "x_generator": {
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      "cveMetadata": {
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        "assignerShortName": "openssl",
        "cveId": "CVE-2022-4450",
        "datePublished": "2023-02-08T19:04:04.874Z",
        "dateReserved": "2022-12-13T13:38:08.598Z",
        "dateUpdated": "2025-11-04T19:14:13.257Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.