UBUNTU-CVE-2025-0650 (CVE-2025-0650)

Vulnerability from osv_ubuntu – Published: 2025-01-23 17:15 – Updated: 2025-09-08 17:06 – Source website
VLAI
Details

A flaw was found in the Open Virtual Network (OVN). Specially crafted UDP packets may bypass egress access control lists (ACLs) in OVN installations configured with a logical switch with DNS records set on it and if the same switch has any egress ACLs configured. This issue can lead to unauthorized access to virtual machines and containers running on the OVN network. OVN provides rudimentary DNS caching as an optional feature to speed up lookups of frequently-used domains. When this feature is enabled, due to the OpenFlow rules that OVN installs in Open vSwitch, it is possible for an attacker to craft a UDP packet that can bypass egress ACL rules. Egress ACL rules are those that have the "direction" set to "to-lport". The OVN installation is vulnerable if a logical switch has DNS records set on it AND if the same switch has any egress ACLs configured on it. The switch is considered to have egress ACLs configured if the switch has an egress ACL configured directly on it using the "acls" column of the logical switch. A switch is also considered to have egress ACLs configured if any of its logical switch ports are part of a port group that has egress ACLs configured in its "acls" column. A python script (vuln_test.py) is attached to this advisory and can be used to determine if your installation is vulnerable. Run it in a location where "ovn-nbctl" is installed and can access the northbound database. The script will print to the console whether the installation is vulnerable.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@20.03.2-0ubuntu0.20.04.6?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "20.03.2-0ubuntu0.20.04.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.12.90~git20200107.c80e014d4-0ubuntu1",
        "2.12.90~git20200107.c80e014d4-0ubuntu2",
        "20.03.0~git20200212.9a4e68ec8-0ubuntu1",
        "20.03.0~git20200212.9a4e68ec8-0ubuntu3",
        "20.03.0-0ubuntu1",
        "20.03.1-0ubuntu1",
        "20.03.1-0ubuntu1.1",
        "20.03.1-0ubuntu1.2",
        "20.03.2-0ubuntu0.20.04.1",
        "20.03.2-0ubuntu0.20.04.2",
        "20.03.2-0ubuntu0.20.04.3",
        "20.03.2-0ubuntu0.20.04.4",
        "20.03.2-0ubuntu0.20.04.5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "22.03.3-0ubuntu0.22.04.5"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "22.03.3-0ubuntu0.22.04.5"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "22.03.3-0ubuntu0.22.04.5"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "22.03.3-0ubuntu0.22.04.5"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "22.03.3-0ubuntu0.22.04.5"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "22.03.3-0ubuntu0.22.04.5"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "22.03.3-0ubuntu0.22.04.5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@22.03.3-0ubuntu0.22.04.5?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "22.03.3-0ubuntu0.22.04.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "21.09.0~git20210922.6549e5842-0ubuntu1",
        "21.09.0~git20210922.6549e5842-0ubuntu2",
        "21.09.0-0ubuntu2",
        "21.12.0-0ubuntu1",
        "22.03.0~git20220218.ed81be7-0ubuntu1",
        "22.03.0-0ubuntu1",
        "22.03.2-0ubuntu0.22.04.1",
        "22.03.3-0ubuntu0.22.04.1",
        "22.03.3-0ubuntu0.22.04.2",
        "22.03.3-0ubuntu0.22.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "24.03.2-0ubuntu0.24.04.2"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "24.03.2-0ubuntu0.24.04.2"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "24.03.2-0ubuntu0.24.04.2"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "24.03.2-0ubuntu0.24.04.2"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "24.03.2-0ubuntu0.24.04.2"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "24.03.2-0ubuntu0.24.04.2"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "24.03.2-0ubuntu0.24.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@24.03.2-0ubuntu0.24.04.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "24.03.2-0ubuntu0.24.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "23.09.0-1",
        "23.09.0-2",
        "24.03.0~git20240205.ebb7076-1",
        "24.03.1-2ubuntu1",
        "24.03.1-2ubuntu3",
        "24.03.2-0ubuntu0.24.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in the Open Virtual Network (OVN). Specially crafted UDP packets may bypass egress access control lists (ACLs) in OVN installations configured with a logical switch with DNS records set on it and if the same switch has any egress ACLs configured. This issue can lead to unauthorized access to virtual machines and containers running on the OVN network. OVN provides rudimentary DNS caching as an optional feature to speed up lookups of frequently-used domains. When this feature is enabled, due to the OpenFlow rules that OVN installs in Open vSwitch, it is possible for an attacker to craft a UDP packet that can bypass egress ACL rules. Egress ACL rules are those that have the \"direction\" set to \"to-lport\". The OVN installation is vulnerable if a logical switch has DNS records set on it AND if the same switch has any egress ACLs configured on it. The switch is considered to have egress ACLs configured if the switch has an egress ACL configured directly on it using the \"acls\" column of the logical switch. A switch is also considered to have egress ACLs configured if any of its logical switch ports are part of a port group that has egress ACLs configured in its \"acls\" column. A python script (vuln_test.py) is attached to this advisory and can be used to determine if your installation is vulnerable. Run it in a location where \"ovn-nbctl\" is installed and can access the northbound database. The script will print to the console whether the installation is vulnerable.",
  "id": "UBUNTU-CVE-2025-0650",
  "modified": "2025-09-08T17:06:47Z",
  "published": "2025-01-23T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-0650"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-0650"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2025/01/22/5"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7396-1"
    }
  ],
  "related": [
    "USN-7396-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-0650"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.