{
  "schema_version": "1.4.0",
  "id": "GHSA-rpmj-rpgj-qmpm",
  "modified": "2025-02-11T09:30:32Z",
  "published": "2025-02-03T17:56:46Z",
  "aliases": [
    "CVE-2025-24898"
  ],
  "summary": "rust-openssl ssl::select_next_proto use after free",
  "details": "### Impact\n`ssl::select_next_proto` can return a slice pointing into the `server` argument's buffer but with a lifetime bound to the `client` argument. In situations where the `server` buffer's lifetime is shorter than the `client` buffer's, this can cause a use after free. This could cause the server to crash or to return arbitrary memory contents to the client.\n\n### Patches\n`openssl` 0.10.70 fixes the signature of `ssl::select_next_proto` to properly constrain the output buffer's lifetime to that of both input buffers.\n\n### Workarounds\nIn standard usage of `ssl::select_next_proto` in the callback passed to `SslContextBuilder::set_alpn_select_callback`, code is only affected if the `server` buffer is constructed *within* the callback. For example:\n\nNot vulnerable - the server buffer has a `'static` lifetime:\n```rust\nbuilder.set_alpn_select_callback(|_, client_protos| {\n    ssl::select_next_proto(b\"\\x02h2\", client_protos).ok_or_else(AlpnError::NOACK)\n});\n```\n\nNot vulnerable - the server buffer outlives the handshake:\n```rust\nlet server_protos = b\"\\x02h2\".to_vec();\nbuilder.set_alpn_select_callback(|_, client_protos| {\n    ssl::select_next_proto(&server_protos, client_protos).ok_or_else(AlpnError::NOACK)\n});\n```\n\nVulnerable - the server buffer is freed when the callback returns:\n```rust\nbuilder.set_alpn_select_callback(|_, client_protos| {\n    let server_protos = b\"\\x02h2\".to_vec();\n    ssl::select_next_proto(&server_protos, client_protos).ok_or_else(AlpnError::NOACK)\n});\n```\n\n### References\nhttps://github.com/sfackler/rust-openssl/pull/2360",
  "severity": [
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "openssl"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0.10.0"
            },
            {
              "fixed": "0.10.70"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sfackler/rust-openssl/security/advisories/GHSA-rpmj-rpgj-qmpm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-24898"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sfackler/rust-openssl/pull/2360"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sfackler/rust-openssl/commit/f014afb230de4d77bc79dea60e7e58c2f47b60f2"
    },
    {
      "type": "WEB",
      "url": "https://crates.io/crates/openssl"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sfackler/rust-openssl"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00009.html"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2025-0004.html"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2025-02-03T17:56:46Z",
    "nvd_published_at": "2025-02-03T18:15:43Z"
  }
}