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CERTFR-2025-AVI-0139
Vulnerability from certfr_avis
De multiples vulnérabilités ont été découvertes dans OpenSSH. Elles permettent à un attaquant de provoquer un déni de service à distance et un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "OpenSSH versions ant\u00e9rieures \u00e0 9.9p2",
"product": {
"name": "OpenSSH",
"vendor": {
"name": "OpenSSH",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2025-26465",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-26465"
},
{
"name": "CVE-2025-26466",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-26466"
}
],
"initial_release_date": "2025-02-18T00:00:00",
"last_revision_date": "2025-02-18T00:00:00",
"links": [],
"reference": "CERTFR-2025-AVI-0139",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2025-02-18T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans OpenSSH. Elles permettent \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance et un contournement de la politique de s\u00e9curit\u00e9.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans OpenSSH",
"vendor_advisories": [
{
"published_at": "2025-02-18",
"title": "Bulletin de s\u00e9curit\u00e9 OpenSSH 9.9p2",
"url": "https://www.openssh.com/txt/release-9.9p2"
}
]
}
CVE-2025-26465 (GCVE-0-2025-26465)
Vulnerability from cvelistv5
Published
2025-02-18 18:27
Modified
2025-10-03 16:16
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-390 - Detection of Error Condition Without Action
Summary
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.
References
| URL | Tags | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Version: 6.8p1 < |
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|
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CVE-2025-26466 (GCVE-0-2025-26466)
Vulnerability from cvelistv5
Published
2025-02-28 21:25
Modified
2025-07-25 07:44
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Version: 9.5p1 < |
||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||
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"value": "Reported to Red Hat."
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{
"lang": "en",
"time": "2025-02-18T00:00:00+00:00",
"value": "Made public."
}
],
"title": "Openssh: denial-of-service in openssh",
"workarounds": [
{
"lang": "en",
"value": "This issue can be mitigated by setting the following three different options in the sshd configuration file located at: /etc/ssh/sshd_config\n\nMaxStartups: Set to a reasonable value, this option controls the maximum number of concurrent unauthenticated connections the SSH server accepts;\n\nPerSourcePenalties: Set its suboptions to a reasonable value, this option is used to help sshd to detect and drop connections that are potentially malicious for the SSH server;\n\nLoginGraceTime: Set to a resonable value, this option controls how much time the SSH server will wait the client to authenticate before dropping its connection;\n\nAll the three option above needs to be set to implement a full mitigation for this vulnerability."
}
],
"x_redhatCweChain": "CWE-770: Allocation of Resources Without Limits or Throttling"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2025-26466",
"datePublished": "2025-02-28T21:25:28.861Z",
"dateReserved": "2025-02-10T18:31:47.979Z",
"dateUpdated": "2025-07-25T07:44:40.029Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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