Vulnerability-Lookup

CNVD-2026-05940

Vulnerability from cnvd - Published: 2026-01-22

Title

GNU InetUtils Telnetd远程认证绕过漏洞

Description

GNU InetUtils telnetd是GNU InetUtils套件中的远程登录服务守护进程，监听TCP 23端口，为客户端提供基于Telnet协议的明文终端接入能力。 GNU InetUtils Telnetd存在远程认证绕过漏洞，攻击者可利用该漏洞通过设置USER环境变量为"-froot"实现远程认证绕过，在无需任何口令的情况下直接获取目标主机的root shell。

Severity

高

Patch Name

GNU InetUtils Telnetd远程认证绕过漏洞的补丁

Patch Description

Formal description

用户可联系供应商获得补丁信息： https://www.openwall.com/lists/oss-security/2026/01/20/2

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-24061

Impacted products

Name
Gnu GNU Inetutils >=1.9.3，<= 2.7

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-24061"
    }
  },
  "description": "GNU InetUtils telnetd\u662fGNU InetUtils\u5957\u4ef6\u4e2d\u7684\u8fdc\u7a0b\u767b\u5f55\u670d\u52a1\u5b88\u62a4\u8fdb\u7a0b\uff0c\u76d1\u542cTCP 23\u7aef\u53e3\uff0c\u4e3a\u5ba2\u6237\u7aef\u63d0\u4f9b\u57fa\u4e8eTelnet\u534f\u8bae\u7684\u660e\u6587\u7ec8\u7aef\u63a5\u5165\u80fd\u529b\u3002\n\nGNU InetUtils Telnetd\u5b58\u5728\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u8bbe\u7f6eUSER\u73af\u5883\u53d8\u91cf\u4e3a\"-froot\"\u5b9e\u73b0\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\uff0c\u5728\u65e0\u9700\u4efb\u4f55\u53e3\u4ee4\u7684\u60c5\u51b5\u4e0b\u76f4\u63a5\u83b7\u53d6\u76ee\u6807\u4e3b\u673a\u7684root shell\u3002",
  "formalWay": "\u7528\u6237\u53ef\u8054\u7cfb\u4f9b\u5e94\u5546\u83b7\u5f97\u8865\u4e01\u4fe1\u606f\uff1a\r\nhttps://www.openwall.com/lists/oss-security/2026/01/20/2",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-05940",
  "openTime": "2026-01-22",
  "patchDescription": "GNU InetUtils telnetd\u662fGNU InetUtils\u5957\u4ef6\u4e2d\u7684\u8fdc\u7a0b\u767b\u5f55\u670d\u52a1\u5b88\u62a4\u8fdb\u7a0b\uff0c\u76d1\u542cTCP 23\u7aef\u53e3\uff0c\u4e3a\u5ba2\u6237\u7aef\u63d0\u4f9b\u57fa\u4e8eTelnet\u534f\u8bae\u7684\u660e\u6587\u7ec8\u7aef\u63a5\u5165\u80fd\u529b\u3002\r\n\r\nGNU InetUtils Telnetd\u5b58\u5728\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u8bbe\u7f6eUSER\u73af\u5883\u53d8\u91cf\u4e3a\"-froot\"\u5b9e\u73b0\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\uff0c\u5728\u65e0\u9700\u4efb\u4f55\u53e3\u4ee4\u7684\u60c5\u51b5\u4e0b\u76f4\u63a5\u83b7\u53d6\u76ee\u6807\u4e3b\u673a\u7684root shell\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "GNU InetUtils Telnetd\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Gnu GNU Inetutils \u003e=1.9.3\uff0c\u003c= 2.7"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-24061",
  "serverity": "\u9ad8",
  "submitTime": "2026-01-22",
  "title": "GNU InetUtils Telnetd\u8fdc\u7a0b\u8ba4\u8bc1\u7ed5\u8fc7\u6f0f\u6d1e"
}

CVE-2026-24061 (GCVE-0-2026-24061)

Vulnerability from cvelistv5 – Published: 2026-01-21 06:42 – Updated: 2026-02-10 17:03

Summary

telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.

Severity ?

9.8 (Critical)


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

CWE

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Assigner

mitre

References

URL

Tags

	https://www.openwall.com/lists/oss-security/2026/…
	https://www.openwall.com/lists/oss-security/2026/…
	https://www.gnu.org/software/inetutils/
	https://lists.gnu.org/archive/html/bug-inetutils/…
	https://codeberg.org/inetutils/inetutils/commit/f…
	https://codeberg.org/inetutils/inetutils/commit/c…
	https://www.vicarius.io/vsociety/posts/cve-2026-2…
	https://www.vicarius.io/vsociety/posts/cve-2026-2…

Impacted products

	Vendor	Product	Version
	GNU	Inetutils	Affected: 1.9.3 , ≤ 2.7 (custom)

Show details on NVD website

JSON

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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

CNVD-2026-05940

CVE-2026-24061 (GCVE-0-2026-24061)

Tags

Sightings

Nomenclature