cvelistv5 - cve-2025-54804

CVE-2025-54804 (GCVE-0-2025-54804)

Vulnerability from cvelistv5 – Published: 2025-08-05 00:05 – Updated: 2025-08-05 14:44

Summary

Russh is a Rust SSH client & server library. In versions 0.54.0 and below, the channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic. A malicious client can crash a server. This is fixed in version 0.54.1.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

	https://github.com/Eugeny/russh/security/advisori…	x_refsource_CONFIRM
	https://github.com/Eugeny/russh/commit/0eb5e40678…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	Eugeny	russh	Affected: < 0.54.1

Show details on NVD website

JSON

To clipboard

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GHSA-H5RC-J5F5-3GCM

Vulnerability from github – Published: 2025-08-04 20:28 – Updated: 2025-08-05 17:11

Summary

russh is missing overflow checks during channel windows adjust

Details

Summary

The channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic. A malicious client can crash a server.

Details

According https://datatracker.ietf.org/doc/html/rfc4254#section-5.2, The value must not overflow. The incorrect handling is done in server/encrypted.rs and client/encrypted.rs in the handling of CHANNEL_WINDOW_ADJUST.

let amount = map_err!(u32::decode(&mut r))?;
...
channel.recipient_window_size += amount;

It could be replaced with something like

  if let Some(ref mut channel) = enc.channels.get_mut(&channel_num) {
                        // rfc 4254: The window MUST NOT be increased above 2^32 - 1 bytes.
                        new_size = channel.recipient_window_size.saturating_add(amount);
                        channel.recipient_window_size = new_size;
                    }
...

PoC

A customized client code would be required to send a message with a big value like u32_max. Not done yet.

Impact

This problem seems only critical to a server. One user can crash the server, which might take down the service. A malicious server could also crash a single client, but this seems not very critical.

Severity ?

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "russh"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.54.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-54804"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-04T20:28:36Z",
    "nvd_published_at": "2025-08-05T01:15:42Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic.  A malicious  client can crash a server. \n\n### Details\nAccording https://datatracker.ietf.org/doc/html/rfc4254#section-5.2, The value must not overflow. \nThe incorrect handling is done in server/encrypted.rs and client/encrypted.rs in the handling of CHANNEL_WINDOW_ADJUST. \n\n```\nlet amount = map_err!(u32::decode(\u0026mut r))?;\n...\nchannel.recipient_window_size += amount;\n```\n\nIt could be replaced with something like \n\n```\n  if let Some(ref mut channel) = enc.channels.get_mut(\u0026channel_num) {\n                        // rfc 4254: The window MUST NOT be increased above 2^32 - 1 bytes.\n                        new_size = channel.recipient_window_size.saturating_add(amount);\n                        channel.recipient_window_size = new_size;\n                    }\n...\n```\n\n### PoC\nA customized client code would be required to send a message with a big value like u32_max. Not done yet.\n\n### Impact\nThis problem seems only critical to a server. One user can crash the server, which might take down the service. A malicious server could also crash a single client, but this seems not very critical.",
  "id": "GHSA-h5rc-j5f5-3gcm",
  "modified": "2025-08-05T17:11:17Z",
  "published": "2025-08-04T20:28:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-54804"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Eugeny/russh/commit/0eb5e406780890e21ff71dd25d731b30676478e5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Eugeny/russh"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "russh is missing overflow checks during channel windows adjust"
}

FKIE_CVE-2025-54804

Vulnerability from fkie_nvd - Published: 2025-08-05 01:15 - Updated: 2025-08-13 18:32

Severity ?

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/Eugeny/russh/commit/0eb5e406780890e21ff71dd25d731b30676478e5	Patch
security-advisories@github.com	https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	russh_project	russh	*
	warpgate_project	warpgate	*

JSON

To clipboard

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    {
      "nodes": [
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            }
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  "cveTags": [],
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    {
      "lang": "en",
      "value": "Russh is a Rust SSH client \u0026 server library. In versions 0.54.0 and below, the channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic. A malicious client can crash a server. This is fixed in version 0.54.1."
    },
    {
      "lang": "es",
      "value": "Russh es una librer\u00eda de cliente y servidor SSH de Rust. En las versiones 0.54.0 y anteriores, el mensaje de ajuste de la ventana de canal del protocolo SSH se utiliza para rastrear el espacio libre en el b\u00fafer de recepci\u00f3n del otro lado de un canal. La implementaci\u00f3n actual toma el valor del mensaje y lo a\u00f1ade a un valor de estado interno. Esto puede provocar un desbordamiento de enteros. Si el c\u00f3digo de Rust se compila con comprobaciones de desbordamiento, se generar\u00e1 un p\u00e1nico. Un cliente malicioso puede colapsar un servidor. Esto se solucion\u00f3 en la versi\u00f3n 0.54.1."
    }
  ],
  "id": "CVE-2025-54804",
  "lastModified": "2025-08-13T18:32:38.050",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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        "impactScore": 3.6,
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    },
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      "tags": [
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    },
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        "Exploit",
        "Vendor Advisory"
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    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2025-54804 (GCVE-0-2025-54804)

GHSA-H5RC-J5F5-3GCM

Summary

Details

PoC

Impact

FKIE_CVE-2025-54804

Tags

Sightings

Nomenclature