msrc_cve-2021-22924
Vulnerability from csaf_microsoft
Published
2021-08-02 00:00
Modified
2021-12-16 00:00
Summary
libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse if one of them matches the setup.Due to errors in the logic the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*which could lead to libcurl reusing wrong connections.File paths are or can be case sensitive on many systems but not all and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.
Notes
Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
{
"document": {
"category": "csaf_vex",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2021-22924 libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse if one of them matches the setup.Due to errors in the logic the config matching function did not take \u0027issuercert\u0027 into account and it compared the involved paths *case insensitively*which could lead to libcurl reusing wrong connections.File paths are or can be case sensitive on many systems but not all and caneven vary depending on used file systems.The comparison also didn\u0027t include the \u0027issuer cert\u0027 which a transfer can setto qualify how to verify the server certificate. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-22924.json"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse if one of them matches the setup.Due to errors in the logic the config matching function did not take \u0027issuercert\u0027 into account and it compared the involved paths *case insensitively*which could lead to libcurl reusing wrong connections.File paths are or can be case sensitive on many systems but not all and caneven vary depending on used file systems.The comparison also didn\u0027t include the \u0027issuer cert\u0027 which a transfer can setto qualify how to verify the server certificate.",
"tracking": {
"current_release_date": "2021-12-16T00:00:00.000Z",
"generator": {
"date": "2025-10-19T22:09:27.532Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2021-22924",
"initial_release_date": "2021-08-02T00:00:00.000Z",
"revision_history": [
{
"date": "2021-08-17T00:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
},
{
"date": "2021-12-16T00:00:00.000Z",
"legacy_version": "1.1",
"number": "2",
"summary": "Added curl to CBL-Mariner 2.0"
}
],
"status": "final",
"version": "2"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version",
"name": "1.0",
"product": {
"name": "CBL Mariner 1.0",
"product_id": "16820"
}
},
{
"category": "product_version",
"name": "2.0",
"product": {
"name": "CBL Mariner 2.0",
"product_id": "17086"
}
}
],
"category": "product_name",
"name": "Azure Linux"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003ccm1 curl 7.76.0-5",
"product": {
"name": "\u003ccm1 curl 7.76.0-5",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "cm1 curl 7.76.0-5",
"product": {
"name": "cm1 curl 7.76.0-5",
"product_id": "19008"
}
},
{
"category": "product_version_range",
"name": "\u003ccbl2 curl 7.76.0-5",
"product": {
"name": "\u003ccbl2 curl 7.76.0-5",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "cbl2 curl 7.76.0-5",
"product": {
"name": "cbl2 curl 7.76.0-5",
"product_id": "19009"
}
}
],
"category": "product_name",
"name": "curl"
}
],
"category": "vendor",
"name": "Microsoft"
}
],
"relationships": [
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ccm1 curl 7.76.0-5 as a component of CBL Mariner 1.0",
"product_id": "16820-2"
},
"product_reference": "2",
"relates_to_product_reference": "16820"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "cm1 curl 7.76.0-5 as a component of CBL Mariner 1.0",
"product_id": "19008-16820"
},
"product_reference": "19008",
"relates_to_product_reference": "16820"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ccbl2 curl 7.76.0-5 as a component of CBL Mariner 2.0",
"product_id": "17086-1"
},
"product_reference": "1",
"relates_to_product_reference": "17086"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "cbl2 curl 7.76.0-5 as a component of CBL Mariner 2.0",
"product_id": "19009-17086"
},
"product_reference": "19009",
"relates_to_product_reference": "17086"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2021-22924",
"cwe": {
"id": "CWE-706",
"name": "Use of Incorrectly-Resolved Name or Reference"
},
"notes": [
{
"category": "general",
"text": "hackerone",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"19008-16820",
"19009-17086"
],
"known_affected": [
"16820-2",
"17086-1"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2021-22924 libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse if one of them matches the setup.Due to errors in the logic the config matching function did not take \u0027issuercert\u0027 into account and it compared the involved paths *case insensitively*which could lead to libcurl reusing wrong connections.File paths are or can be case sensitive on many systems but not all and caneven vary depending on used file systems.The comparison also didn\u0027t include the \u0027issuer cert\u0027 which a transfer can setto qualify how to verify the server certificate. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-22924.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2021-08-17T00:00:00.000Z",
"details": "7.76.0-5:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
"product_ids": [
"16820-2",
"17086-1"
],
"url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"environmentalsScore": 0.0,
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"temporalScore": 3.7,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"products": [
"16820-2",
"17086-1"
]
}
],
"title": "libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse if one of them matches the setup.Due to errors in the logic the config matching function did not take \u0027issuercert\u0027 into account and it compared the involved paths *case insensitively*which could lead to libcurl reusing wrong connections.File paths are or can be case sensitive on many systems but not all and caneven vary depending on used file systems.The comparison also didn\u0027t include the \u0027issuer cert\u0027 which a transfer can setto qualify how to verify the server certificate."
}
]
}
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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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