Vulnerability-Lookup

CNVD-2020-51420

Vulnerability from cnvd - Published: 2020-09-10

Title

xrdp-sesman service缓冲区溢出漏洞

Description

xrdp-sesman service是一款开源的RDP（远程桌面协议）服务器。 xrdp-sesman service 0.9.13.1之前版本中存在缓冲区溢出漏洞，远程攻击者可通过连接3350端口并提供恶意的payload利用该漏洞在系统上执行任意代码或导致应用程序崩溃（拒绝服务）。

Severity

中

Patch Name

xrdp-sesman service缓冲区溢出漏洞的补丁

Patch Description

xrdp-sesman service是一款开源的RDP（远程桌面协议）服务器。 xrdp-sesman service 0.9.13.1之前版本中存在缓冲区溢出漏洞，远程攻击者可通过连接3350端口并提供恶意的payload利用该漏洞在系统上执行任意代码或导致应用程序崩溃（拒绝服务）。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-4044

Impacted products

Name
Xrdp xrdp-sesman service <0.9.13.1

Show details on source website

JSON

To clipboard

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  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-4044"
    }
  },
  "description": "xrdp-sesman service\u662f\u4e00\u6b3e\u5f00\u6e90\u7684RDP\uff08\u8fdc\u7a0b\u684c\u9762\u534f\u8bae\uff09\u670d\u52a1\u5668\u3002\n\nxrdp-sesman service 0.9.13.1\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8fde\u63a53350\u7aef\u53e3\u5e76\u63d0\u4f9b\u6076\u610f\u7684payload\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u7cfb\u7edf\u4e0a\u6267\u884c\u4efb\u610f\u4ee3\u7801\u6216\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\uff08\u62d2\u7edd\u670d\u52a1\uff09\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-51420",
  "openTime": "2020-09-10",
  "patchDescription": "xrdp-sesman service\u662f\u4e00\u6b3e\u5f00\u6e90\u7684RDP\uff08\u8fdc\u7a0b\u684c\u9762\u534f\u8bae\uff09\u670d\u52a1\u5668\u3002\r\n\r\nxrdp-sesman service 0.9.13.1\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8fde\u63a53350\u7aef\u53e3\u5e76\u63d0\u4f9b\u6076\u610f\u7684payload\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u7cfb\u7edf\u4e0a\u6267\u884c\u4efb\u610f\u4ee3\u7801\u6216\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\uff08\u62d2\u7edd\u670d\u52a1\uff09\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": "xrdp-sesman service\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Xrdp xrdp-sesman service \u003c0.9.13.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-4044",
  "serverity": "\u4e2d",
  "submitTime": "2020-07-01",
  "title": "xrdp-sesman service\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

CVE-2020-4044 (GCVE-0-2020-4044)

Vulnerability from cvelistv5 – Published: 2020-06-30 15:55 – Updated: 2024-08-04 07:52

Title

Local users can perform a buffer overflow attack against the xrdp-sesman service and then impersonate it

Summary

The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious payload. Once the xrdp-sesman process is dead, an unprivileged attacker on the server could then proceed to start their own imposter sesman service listening on port 3350. This will allow them to capture any user credentials that are submitted to XRDP and approve or reject arbitrary login credentials. For xorgxrdp sessions in particular, this allows an unauthorized user to hijack an existing session. This is a buffer overflow attack, so there may be a risk of arbitrary code execution as well.

Severity

7.5 (High)


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

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/neutrinolabs/xrdp/security/adv…	x_refsource_CONFIRM
https://github.com/neutrinolabs/xrdp/releases/tag…	x_refsource_MISC
https://github.com/neutrinolabs/xrdp/commit/0c791…	x_refsource_MISC
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
https://www.debian.org/security/2020/dsa-4737	vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE

Impacted products

1 product

Vendor	Product	Version
neutrinolabs	xrdp	Affected: < 0.9.13.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T07:52:20.840Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.13.1"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/neutrinolabs/xrdp/commit/0c791d073d0eb344ee7aaafd221513dc9226762c"
          },
          {
            "name": "openSUSE-SU-2020:0999",
            "tags": [
              "vendor-advisory",
              "x_refsource_SUSE",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00036.html"
          },
          {
            "name": "DSA-4737",
            "tags": [
              "vendor-advisory",
              "x_refsource_DEBIAN",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2020/dsa-4737"
          },
          {
            "name": "[debian-lts-announce] 20200809 [SECURITY] [DLA 2319-1] xrdp security update",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2020/08/msg00015.html"
          },
          {
            "name": "openSUSE-SU-2020:1200",
            "tags": [
              "vendor-advisory",
              "x_refsource_SUSE",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00037.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "xrdp",
          "vendor": "neutrinolabs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.9.13.1"
            }
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        }
      ],
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          }
        }
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      ],
      "providerMetadata": {
        "dateUpdated": "2020-08-14T20:06:17.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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          "tags": [
            "x_refsource_CONFIRM"
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        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.13.1"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/neutrinolabs/xrdp/commit/0c791d073d0eb344ee7aaafd221513dc9226762c"
        },
        {
          "name": "openSUSE-SU-2020:0999",
          "tags": [
            "vendor-advisory",
            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00036.html"
        },
        {
          "name": "DSA-4737",
          "tags": [
            "vendor-advisory",
            "x_refsource_DEBIAN"
          ],
          "url": "https://www.debian.org/security/2020/dsa-4737"
        },
        {
          "name": "[debian-lts-announce] 20200809 [SECURITY] [DLA 2319-1] xrdp security update",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2020/08/msg00015.html"
        },
        {
          "name": "openSUSE-SU-2020:1200",
          "tags": [
            "vendor-advisory",
            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00037.html"
        }
      ],
      "source": {
        "advisory": "GHSA-j9fv-6fwf-p3g4",
        "discovery": "UNKNOWN"
      },
      "title": "Local users can perform a buffer overflow attack against the xrdp-sesman service and then impersonate it",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2020-4044",
          "STATE": "PUBLIC",
          "TITLE": "Local users can perform a buffer overflow attack against the xrdp-sesman service and then impersonate it"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "xrdp",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 0.9.13.1"
                          }
                        ]
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                    }
                  ]
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        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious payload. Once the xrdp-sesman process is dead, an unprivileged attacker on the server could then proceed to start their own imposter sesman service listening on port 3350. This will allow them to capture any user credentials that are submitted to XRDP and approve or reject arbitrary login credentials. For xorgxrdp sessions in particular, this allows an unauthorized user to hijack an existing session. This is a buffer overflow attack, so there may be a risk of arbitrary code execution as well."
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        "references": {
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              "url": "https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4"
            },
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            },
            {
              "name": "openSUSE-SU-2020:0999",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00036.html"
            },
            {
              "name": "DSA-4737",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2020/dsa-4737"
            },
            {
              "name": "[debian-lts-announce] 20200809 [SECURITY] [DLA 2319-1] xrdp security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2020/08/msg00015.html"
            },
            {
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              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00037.html"
            }
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          "discovery": "UNKNOWN"
        }
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  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2020-4044",
    "datePublished": "2020-06-30T15:55:13.000Z",
    "dateReserved": "2019-12-30T00:00:00.000Z",
    "dateUpdated": "2024-08-04T07:52:20.840Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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