CWE-234
Failure to Handle Missing Parameter
If too few arguments are sent to a function, the function will still pop the expected number of arguments from the stack. Potentially, a variable number of arguments could be exhausted in a function as well.
CVE-2022-20933 (GCVE-0-2022-20933)
Vulnerability from cvelistv5
Published
2022-10-26 14:00
Modified
2024-11-01 18:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z3 Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit this vulnerability by crafting a malicious request and sending it to the affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to crash and restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention. Cisco Meraki has released software updates that address this vulnerability.
References
► | URL | Tags |
---|---|---|
Impacted products
Vendor | Product | Version | ||
---|---|---|---|---|
Cisco | Cisco Meraki MX Firmware |
Version: n/a |
{ "containers": { "adp": [ { "providerMetadata": { "dateUpdated": "2024-08-03T02:31:57.978Z", "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE" }, "references": [ { "name": "20221019 Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability", "tags": [ "vendor-advisory", "x_transferred" ], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-vnESbgBf" } ], "title": "CVE Program Container" }, { "metrics": [ { "other": { "content": { "id": "CVE-2022-20933", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "timestamp": "2024-11-01T18:43:45.653455Z", "version": "2.0.3" }, "type": "ssvc" } } ], "providerMetadata": { "dateUpdated": "2024-11-01T18:48:56.789Z", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP" }, "title": "CISA ADP Vulnrichment" } ], "cna": { "affected": [ { "product": "Cisco Meraki MX Firmware", "vendor": "Cisco", "versions": [ { "status": "affected", "version": "n/a" } ] } ], "datePublic": "2022-10-19T00:00:00", "descriptions": [ { "lang": "en", "value": "A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z3 Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit this vulnerability by crafting a malicious request and sending it to the affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to crash and restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention. Cisco Meraki has released software updates that address this vulnerability." } ], "exploits": [ { "lang": "en", "value": "Neither the Cisco Product Security Incident Response Team (PSIRT) nor the Cisco Meraki Incident Response Team is aware of any malicious use of the vulnerability that is described in this advisory." } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-234", "description": "CWE-234", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2022-10-26T00:00:00", "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco" }, "references": [ { "name": "20221019 Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability", "tags": [ "vendor-advisory" ], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-vnESbgBf" } ], "source": { "advisory": "cisco-sa-meraki-mx-vpn-dos-vnESbgBf", "defect": [ [ "NA" ] ], "discovery": "INTERNAL" }, "title": "Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability" } }, "cveMetadata": { "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "assignerShortName": "cisco", "cveId": "CVE-2022-20933", "datePublished": "2022-10-26T14:00:34.721945Z", "dateReserved": "2021-11-02T00:00:00", "dateUpdated": "2024-11-01T18:48:56.789Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }
Mitigation
Phase: Build and Compilation
Description:
- This issue can be simply combated with the use of proper build process.
Mitigation
Phase: Implementation
Description:
- Forward declare all functions. This is the recommended solution. Properly forward declaration of all used functions will result in a compiler error if too few arguments are sent to a function.
No CAPEC attack patterns related to this CWE.