rustsec-2021-0055
Vulnerability from osv_rustsec
Published
2021-05-01 12:00
Modified
2023-06-13 13:10
Summary
NULL pointer deref in signature_algorithms processing
Details

An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack.

A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "denial-of-service"
        ],
        "cvss": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "openssl-src",
        "purl": "pkg:cargo/openssl-src"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "111.15.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2021-3449",
    "GHSA-83mx-573x-5rw9"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation\nClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits\nthe signature_algorithms extension (where it was present in the initial\nClientHello), but includes a signature_algorithms_cert extension then a NULL\npointer dereference will result, leading to a crash and a denial of service\nattack.\n\nA server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which\nis the default configuration). OpenSSL TLS clients are not impacted by this\nissue.",
  "id": "RUSTSEC-2021-0055",
  "modified": "2023-06-13T13:10:24Z",
  "published": "2021-05-01T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/openssl-src"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0055.html"
    },
    {
      "type": "WEB",
      "url": "https://www.openssl.org/news/secadv/20210325.txt"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NULL pointer deref in signature_algorithms processing"
}


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