FKIE_CVE-2016-2167
Vulnerability from fkie_nvd - Published: 2016-05-05 18:59 - Updated: 2026-06-17 00:43
Severity
Summary
The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| apache | subversion | * | |
| apache | subversion | 1.9.0 | |
| apache | subversion | 1.9.1 | |
| apache | subversion | 1.9.2 | |
| apache | subversion | 1.9.3 |
{
"affected": [
{
"affectedData": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"source": "secalert@redhat.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:*",
"matchCriteriaId": "DD9BA15E-397D-4B1F-B755-8FFBBF58AE59",
"versionEndIncluding": "1.8.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:subversion:1.9.0:*:*:*:*:*:*:*",
"matchCriteriaId": "892FF423-1848-4E69-8C4C-E1972B656196",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:subversion:1.9.1:*:*:*:*:*:*:*",
"matchCriteriaId": "9ACF37C7-8752-4A8F-B7E3-2E813C4A0DF0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:subversion:1.9.2:*:*:*:*:*:*:*",
"matchCriteriaId": "74200C33-9505-48EB-964D-6CA28C7F6DB8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:subversion:1.9.3:*:*:*:*:*:*:*",
"matchCriteriaId": "09FBAFE7-986D-4B24-8122-FDCC380331C9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string."
},
{
"lang": "es",
"value": "La funci\u00f3n canonicalize_username en svnserve/cyrus_auth.c en Apache Subversion en versiones anteriores a 1.8.16 y 1.9.x en versiones anteriores a 1.9.4, cuando se utiliza autenticaci\u00f3n Cyrus SASL, permite a atacantes remotos autenticarse y eludir restricciones destinadas al acceso a trav\u00e9s de una cadena realm que se prefija a un repositorio de cadena realm esperado."
}
],
"id": "CVE-2016-2167",
"lastModified": "2026-06-17T00:43:34.313",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "NONE",
"baseScore": 4.9,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 6.8,
"impactScore": 4.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV30": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.0"
},
"exploitabilityScore": 1.6,
"impactScore": 5.2,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2016-05-05T18:59:00.117",
"references": [
{
"source": "secalert@redhat.com",
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html"
},
{
"source": "secalert@redhat.com",
"url": "http://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html"
},
{
"source": "secalert@redhat.com",
"url": "http://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html"
},
{
"source": "secalert@redhat.com",
"url": "http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgJet+7_MAhomFVOXPgLtewcUw9w=k9zdPCkq5tvPxVMA%40mail.gmail.com%3E"
},
{
"source": "secalert@redhat.com",
"url": "http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgfn1iKueW51EpmXzXi_URNfGNofZSgOyW1_jnSeNm5DQ%40mail.gmail.com%3E"
},
{
"source": "secalert@redhat.com",
"tags": [
"Vendor Advisory"
],
"url": "http://subversion.apache.org/security/CVE-2016-2167-advisory.txt"
},
{
"source": "secalert@redhat.com",
"url": "http://www.debian.org/security/2016/dsa-3561"
},
{
"source": "secalert@redhat.com",
"url": "http://www.securityfocus.com/bid/89417"
},
{
"source": "secalert@redhat.com",
"url": "http://www.securitytracker.com/id/1035706"
},
{
"source": "secalert@redhat.com",
"url": "http://www.slackware.com/security/viewer.php?l=slackware-security\u0026y=2016\u0026m=slackware-security.417496"
},
{
"source": "secalert@redhat.com",
"url": "https://security.gentoo.org/glsa/201610-05"
},
{
"source": "secalert@redhat.com",
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgJet+7_MAhomFVOXPgLtewcUw9w=k9zdPCkq5tvPxVMA%40mail.gmail.com%3E"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgfn1iKueW51EpmXzXi_URNfGNofZSgOyW1_jnSeNm5DQ%40mail.gmail.com%3E"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "http://subversion.apache.org/security/CVE-2016-2167-advisory.txt"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.debian.org/security/2016/dsa-3561"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securityfocus.com/bid/89417"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securitytracker.com/id/1035706"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.slackware.com/security/viewer.php?l=slackware-security\u0026y=2016\u0026m=slackware-security.417496"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://security.gentoo.org/glsa/201610-05"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-284"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
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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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.
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