FKIE_CVE-2011-2536
Vulnerability from fkie_nvd - Published: 2011-07-06 19:55 - Updated: 2026-06-16 23:31
Severity
Summary
chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.
References
Impacted products
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"criteria": "cpe:2.3:a:digium:asterisk:1.4.40.1:*:*:*:*:*:*:*",
"matchCriteriaId": "F745AF0A-D6A6-4429-BBBE-347BF41999BF",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:1.4.40.2:*:*:*:*:*:*:*",
"matchCriteriaId": "DC44F61B-AB96-4643-899B-19B9E3B4F05C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:1.4.41:*:*:*:*:*:*:*",
"matchCriteriaId": "F788A255-CF21-424F-9F30-8A744CC16740",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:1.4.41:rc1:*:*:*:*:*:*",
"matchCriteriaId": "92B8AA8E-D49B-4AD7-8AFC-BD4F9E9C7A16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:1.4.41.1:*:*:*:*:*:*:*",
"matchCriteriaId": "0606F179-8817-4124-B92B-CD868B216320",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.0:-:business:*:*:*:*:*",
"matchCriteriaId": "78E8936C-033B-49E6-BB39-D5BBBC80EB55",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.1.0:-:business:*:*:*:*:*",
"matchCriteriaId": "5D05D04F-CD6C-4A73-885C-306D7A5CC7C4",
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},
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.1.1:-:business:*:*:*:*:*",
"matchCriteriaId": "3805B5F3-A4CD-469F-9F8A-A271A79A2B7C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.2.2:-:business:*:*:*:*:*",
"matchCriteriaId": "9FAEBE5E-378A-40DC-B2B9-31F6D1305BCE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.2.3:-:business:*:*:*:*:*",
"matchCriteriaId": "617B3FE8-39E3-41C0-9348-9507DA43DE93",
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},
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.3.2:-:business:*:*:*:*:*",
"matchCriteriaId": "04AB4C82-71BB-49B7-B4F3-4E75EFB5F1A6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.6.2:-:business:*:*:*:*:*",
"matchCriteriaId": "78B55176-E269-411B-974A-B5D2CE8E08C2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:digium:asterisk:c.3.6.3:-:business:*:*:*:*:*",
"matchCriteriaId": "9BCF12B0-4B8D-499D-B5DE-FB0CD9EEC3B4",
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},
{
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}
],
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests."
},
{
"lang": "es",
"value": "chan_sip.c en el controlador de canal SIP en Asterisk Open Source v1.4.x anteriores a v1.4.41.2, v1.6.2.x anteriores a v1.6.2.18.2, y v1.8.x anteriores a v1.8.4.4, y Asterisk Business Edition vC.3.x anteriores a vC.3.7.3,no tiene en cuenta la opci\u00f3n alwaysauthreject y genera diferentes respuestas no v\u00e1lidas para solicitudes SIP en funci\u00f3n de si la cuenta de usuario existe, lo que permite a atacantes remotos enumerar los nombres de cuenta a trav\u00e9s de una serie de peticiones."
}
],
"id": "CVE-2011-2536",
"lastModified": "2026-06-16T23:31:33.883",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
]
},
"published": "2011-07-06T19:55:03.543",
"references": [
{
"source": "cve@mitre.org",
"tags": [
"Patch"
],
"url": "http://downloads.asterisk.org/pub/security/AST-2011-011-1.8.diff"
},
{
"source": "cve@mitre.org",
"tags": [
"Vendor Advisory"
],
"url": "http://downloads.asterisk.org/pub/security/AST-2011-011.html"
},
{
"source": "cve@mitre.org",
"url": "http://www.securitytracker.com/id?1025734"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "http://downloads.asterisk.org/pub/security/AST-2011-011-1.8.diff"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "http://downloads.asterisk.org/pub/security/AST-2011-011.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securitytracker.com/id?1025734"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-200"
}
],
"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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