CVE-2021-33026

** DISPUTED ** The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code. NOTE: a third party indicates that exploitation is extremely unlikely unless the machine is already compromised; in other cases, the attacker would be unable to write their payload to the cache and generate the required collision.

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

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

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/sh4nks/flask-caching/pull/209	Patch Third Party Advisory
https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937

Advertisement

Configurations

Configuration 1 (hide)

cpe:2.3:a:flask-caching_project:flask-caching:*:*:*:*:*:flask:*:*

Information

Published : 2021-05-13 16:15

Updated : 2022-09-16 16:15

NVD link : CVE-2021-33026

Mitre link : CVE-2021-33026

JSON object : View

CWE

CWE-502

Deserialization of Untrusted Data

Advertisement

Products Affected

flask-caching_project

flask-caching

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://github.com/sh4nks/flask-caching/pull/209", "name": "https://github.com/sh4nks/flask-caching/pull/209", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937", "name": "https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937", "tags": [], "refsource": "MISC"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "** DISPUTED ** The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code. NOTE: a third party indicates that exploitation is extremely unlikely unless the machine is already compromised; in other cases, the attacker would be unable to write their payload to the cache and generate the required collision."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-502"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2021-33026", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 7.5, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "severity": "HIGH", "acInsufInfo": false, "impactScore": 6.4, "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}}, "publishedDate": "2021-05-13T23:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:flask-caching_project:flask-caching:*:*:*:*:*:flask:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "1.10.1"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2022-09-16T23:15Z"}