CVE-2021-26843

An issue was discovered in sthttpd through 2.27.1. On systems where the strcpy function is implemented with memcpy, the de_dotdot function may cause a Denial-of-Service (daemon crash) due to overlapping memory ranges being passed to memcpy. This can triggered with an HTTP GET request for a crafted filename. NOTE: this is similar to CVE-2017-10671, but occurs in a different part of the de_dotdot function.

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://github.com/blueness/sthttpd/issues/14	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:sthttpd_project:sthttpd:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-02-07 21:15

Updated : 2024-02-28 18:08

NVD link : CVE-2021-26843

Mitre link : CVE-2021-26843

CVE.ORG link : CVE-2021-26843

JSON object : View

Products Affected

sthttpd_project

sthttpd

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

{"id": "CVE-2021-26843", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2021-02-07T21:15:11.790", "references": [{"url": "https://github.com/blueness/sthttpd/issues/14", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-119"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in sthttpd through 2.27.1. On systems where the strcpy function is implemented with memcpy, the de_dotdot function may cause a Denial-of-Service (daemon crash) due to overlapping memory ranges being passed to memcpy. This can triggered with an HTTP GET request for a crafted filename. NOTE: this is similar to CVE-2017-10671, but occurs in a different part of the de_dotdot function."}, {"lang": "es", "value": "Se ha detectado un problema en sthttpd versiones hasta 2.27.1. En los sistemas en los que la funci\u00f3n strcpy es implementada con memcpy, la funci\u00f3n de_dotdot puede causar una denegaci\u00f3n de servicio (bloqueo del demonio) debido a la superposici\u00f3n de rangos de memoria que se pasan a memcpy. Esto puede desencadenar con una petici\u00f3n HTTP GET para un nombre de archivo dise\u00f1ado. NOTA: esto es similar a CVE-2017-10671, pero ocurre en una parte diferente de la funci\u00f3n de_dotdot"}], "lastModified": "2021-02-09T14:00:58.187", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:sthttpd_project:sthttpd:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A20AC738-9C0B-480E-8C76-37DB8BC6A098", "versionEndIncluding": "2.27.1"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}