Vulnerability-Lookup

ubuntu-cve-2024-39894

Vulnerability from osv_ubuntu

Published

2024-07-02 18:15

Modified

2025-09-08 17:01

Summary

Details

OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off password entry (e.g., for su and Sudo) because of an ObscureKeystrokeTiming logic error. Similarly, other timing attacks against keystroke entry could occur.

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2024-39894	REPORT
	https://www.cve.org/CVERecord?id=CVE-2024-39894	REPORT
	https://lists.mindrot.org/pipermail/openssh-unix-…	REPORT
	https://www.openwall.com/lists/oss-security/2024/…	REPORT
	https://www.openssh.com/txt/release-9.8	REPORT
	https://ubuntu.com/security/notices/USN-6887-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "openssh-tests",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.6p1-3ubuntu13.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.3p1-1ubuntu3",
        "1:9.4p1-1ubuntu1",
        "1:9.6p1-3ubuntu1",
        "1:9.6p1-3ubuntu2",
        "1:9.6p1-3ubuntu11",
        "1:9.6p1-3ubuntu12",
        "1:9.6p1-3ubuntu13",
        "1:9.6p1-3ubuntu13.3"
      ]
    }
  ],
  "aliases": [],
  "details": "OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off password entry (e.g., for su and Sudo) because of an ObscureKeystrokeTiming logic error. Similarly, other timing attacks against keystroke entry could occur.",
  "id": "UBUNTU-CVE-2024-39894",
  "modified": "2025-09-08T17:01:42Z",
  "published": "2024-07-02T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2024-39894"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-39894"
    },
    {
      "type": "REPORT",
      "url": "https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2024/07/02/1"
    },
    {
      "type": "REPORT",
      "url": "https://www.openssh.com/txt/release-9.8"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6887-1"
    }
  ],
  "related": [
    "USN-6887-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2024-39894"
  ]
}

CVE-2024-39894 (GCVE-0-2024-39894)

Vulnerability from cvelistv5 – Published: 2024-07-02 00:00 – Updated: 2025-11-04 16:12

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

n/a
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

mitre

References

12 references

URL	Tags
https://www.openssh.com/txt/release-9.8
https://lists.mindrot.org/pipermail/openssh-unix-…
https://www.openwall.com/lists/oss-security/2024/…
http://www.openwall.com/lists/oss-security/2024/07/03/6	mailing-list
https://security.netapp.com/advisory/ntap-2024071…
http://www.openwall.com/lists/oss-security/2024/07/23/4	mailing-list
http://www.openwall.com/lists/oss-security/2024/07/23/6	mailing-list
http://www.openwall.com/lists/oss-security/2024/07/28/3	mailing-list
https://crzphil.github.io/posts/ssh-obfuscation-bypass/
https://news.ycombinator.com/item?id=41508530
https://www.freebsd.org/security/advisories/FreeB…
http://seclists.org/fulldisclosure/2024/Sep/33

Impacted products

1 product

Vendor	Product	Version
openbsd	openssh	Affected: 9.5 , ≤ 9.7 (custom) cpe:2.3:a:openbsd:openssh:9.5:-::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:openbsd:openssh:9.5:-:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "openssh",
            "vendor": "openbsd",
            "versions": [
              {
                "lessThanOrEqual": "9.7",
                "status": "affected",
                "version": "9.5",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-39894",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-07-03T13:15:38.073610Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-367",
                "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-07-03T13:15:54.538Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T16:12:30.897Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-25:01.openssh.asc"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.openssh.com/txt/release-9.8"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2024/07/02/1"
          },
          {
            "name": "[oss-security] 20240703 Re: Announce: OpenSSH 9.8 released",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/07/03/6"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20240712-0004/"
          },
          {
            "name": "[oss-security] 20240723 Re: linux-distros application for CentOS Project\u0027s Hyperscale SIG",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/07/23/4"
          },
          {
            "name": "[oss-security] 20240723 Re: linux-distros application for CentOS Project\u0027s Hyperscale SIG",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/07/23/6"
          },
          {
            "name": "[oss-security] 20240728 Re: Announce: OpenSSH 9.8 released",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/07/28/3"
          },
          {
            "url": "http://seclists.org/fulldisclosure/2024/Sep/33"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off password entry (e.g., for su and Sudo) because of an ObscureKeystrokeTiming logic error. Similarly, other timing attacks against keystroke entry could occur."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-09-11T15:12:12.186Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://www.openssh.com/txt/release-9.8"
        },
        {
          "url": "https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html"
        },
        {
          "url": "https://www.openwall.com/lists/oss-security/2024/07/02/1"
        },
        {
          "name": "[oss-security] 20240703 Re: Announce: OpenSSH 9.8 released",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2024/07/03/6"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20240712-0004/"
        },
        {
          "name": "[oss-security] 20240723 Re: linux-distros application for CentOS Project\u0027s Hyperscale SIG",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2024/07/23/4"
        },
        {
          "name": "[oss-security] 20240723 Re: linux-distros application for CentOS Project\u0027s Hyperscale SIG",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2024/07/23/6"
        },
        {
          "name": "[oss-security] 20240728 Re: Announce: OpenSSH 9.8 released",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2024/07/28/3"
        },
        {
          "url": "https://crzphil.github.io/posts/ssh-obfuscation-bypass/"
        },
        {
          "url": "https://news.ycombinator.com/item?id=41508530"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2024-39894",
    "datePublished": "2024-07-02T00:00:00.000Z",
    "dateReserved": "2024-07-02T00:00:00.000Z",
    "dateUpdated": "2025-11-04T16:12:30.897Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

usn-6887-1

Vulnerability from osv_ubuntu

Published

2024-07-09 14:04

Modified

2026-02-10 04:44

Summary

openssh vulnerability

Details

Philippos Giavridis, Jacky Wei En Kung, Daniel Hugenroth, and Alastair Beresford discovered that the OpenSSH ObscureKeystrokeTiming feature did not work as expected. A remote attacker could possibly use this issue to determine timing information about keystrokes.

References

URL

Type

	https://ubuntu.com/security/notices/USN-6887-1	ADVISORY
	https://ubuntu.com/security/CVE-2024-39894	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2024-39894",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "openssh-tests",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:9.6p1-3ubuntu13.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.6p1-3ubuntu13.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.3p1-1ubuntu3",
        "1:9.4p1-1ubuntu1",
        "1:9.6p1-3ubuntu1",
        "1:9.6p1-3ubuntu2",
        "1:9.6p1-3ubuntu11",
        "1:9.6p1-3ubuntu12",
        "1:9.6p1-3ubuntu13",
        "1:9.6p1-3ubuntu13.3"
      ]
    }
  ],
  "aliases": [],
  "details": "Philippos Giavridis, Jacky Wei En Kung, Daniel Hugenroth, and Alastair\nBeresford discovered that the OpenSSH ObscureKeystrokeTiming feature did\nnot work as expected. A remote attacker could possibly use this issue to\ndetermine timing information about keystrokes.\n",
  "id": "USN-6887-1",
  "modified": "2026-02-10T04:44:21Z",
  "published": "2024-07-09T14:04:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6887-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2024-39894"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssh vulnerability",
  "upstream": [
    "UBUNTU-CVE-2024-39894"
  ]
}

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.

Action not permitted

ubuntu-cve-2024-39894

Vulnerability from osv_ubuntu

CVE-2024-39894 (GCVE-0-2024-39894)

usn-6887-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature