msrc_cve-2019-6293
Vulnerability from csaf_microsoft
Published
2019-01-02 00:00
Modified
2024-06-30 07:00
Summary
An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of '*' characters. Remote attackers could leverage this vulnerability to cause a denial-of-service.
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.
{
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"title": "Additional Resources"
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{
"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"
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],
"publisher": {
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"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
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"references": [
{
"category": "self",
"summary": "CVE-2019-6293 An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of \u0027*\u0027 characters. Remote attackers could leverage this vulnerability to cause a denial-of-service. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2019/msrc_cve-2019-6293.json"
},
{
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{
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"url": "https://www.first.org/cvss"
}
],
"title": "An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of \u0027*\u0027 characters. Remote attackers could leverage this vulnerability to cause a denial-of-service.",
"tracking": {
"current_release_date": "2024-06-30T07:00:00.000Z",
"generator": {
"date": "2025-10-19T17:28:43.577Z",
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"summary": "Information published."
},
{
"date": "2021-12-16T00:00:00.000Z",
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"number": "2",
"summary": "Added flex to CBL-Mariner 2.0"
},
{
"date": "2024-06-30T07:00:00.000Z",
"legacy_version": "1.2",
"number": "3",
"summary": "Information published."
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"status": "final",
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"vulnerabilities": [
{
"cve": "CVE-2019-6293",
"cwe": {
"id": "CWE-674",
"name": "Uncontrolled Recursion"
},
"notes": [
{
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"text": "mitre",
"title": "Assigning CNA"
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{
"category": "self",
"summary": "CVE-2019-6293 An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of \u0027*\u0027 characters. Remote attackers could leverage this vulnerability to cause a denial-of-service. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2019/msrc_cve-2019-6293.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2020-08-18T00:00:00.000Z",
"details": "2.6.4-6:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"environmentalsScore": 0.0,
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"temporalScore": 5.5,
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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],
"title": "An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of \u0027*\u0027 characters. Remote attackers could leverage this vulnerability to cause a denial-of-service."
}
]
}
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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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