CVE-2023-20215

Published Aug 3, 2023 CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed

Description

A vulnerability in the scanning engines of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass a configured rule, allowing traffic onto a network that should have been blocked.

This vulnerability is due to improper detection of malicious traffic when the traffic is encoded with a specific content format. An attacker could exploit this vulnerability by using an affected device to connect to a malicious server and receiving crafted HTTP responses. A successful exploit could allow the attacker to bypass an explicit block rule and receive traffic that should have been rejected by the device.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Secure Web Appliance

affected

Version	Status	Constraints
`11.7.0-406`	affected	—
`11.7.0-418`	affected	—
`11.7.1-049`	affected	—
`11.7.1-006`	affected	—
`11.7.1-020`	affected	—
`11.7.2-011`	affected	—
`11.8.0-414`	affected	—
`11.8.1-023`	affected	—
`11.8.3-018`	affected	—
`11.8.3-021`	affected	—
`12.0.1-268`	affected	—
`12.0.3-007`	affected	—
`12.5.2-007`	affected	—
`12.5.1-011`	affected	—
`12.5.4-005`	affected	—
`12.5.5-004`	affected	—
`14.5.0-498`	affected	—
`14.5.1-016`	affected	—
`14.0.3-014`	affected	—
`14.0.2-012`	affected	—
`14.0.4-005`	affected	—

Configuration 1 [-]

AND

OR	cpe:2.3:o:cisco:asyncos:11.7.0-406:::::::*
	cpe:2.3:o:cisco:asyncos:11.7.0-418:::::::*
	cpe:2.3:o:cisco:asyncos:11.7.1-006:::::::*
	cpe:2.3:o:cisco:asyncos:11.7.1-020:::::::*
	cpe:2.3:o:cisco:asyncos:11.7.1-049:::::::*
	cpe:2.3:o:cisco:asyncos:11.7.2-011:::::::*
	cpe:2.3:o:cisco:asyncos:11.8.0-414:::::::*
	cpe:2.3:o:cisco:asyncos:11.8.1-023:::::::*
	cpe:2.3:o:cisco:asyncos:11.8.3-018:::::::*
	cpe:2.3:o:cisco:asyncos:11.8.3-021:::::::*
	cpe:2.3:o:cisco:asyncos:12.0.1-268:::::::*
	cpe:2.3:o:cisco:asyncos:12.0.3-007:::::::*
	cpe:2.3:o:cisco:asyncos:12.5.1-011:::::::*
	cpe:2.3:o:cisco:asyncos:12.5.2-007:::::::*
	cpe:2.3:o:cisco:asyncos:12.5.4-005:::::::*
	cpe:2.3:o:cisco:asyncos:12.5.5-004:::::::*
	cpe:2.3:o:cisco:asyncos:14.0.2-012:::::::*
	cpe:2.3:o:cisco:asyncos:14.0.3-014:::::::*
	cpe:2.3:o:cisco:asyncos:14.0.4-005:::::::*
	cpe:2.3:o:cisco:asyncos:14.5.0-498:::::::*
	cpe:2.3:o:cisco:asyncos:14.5.1-008:::::::*
	cpe:2.3:o:cisco:asyncos:14.5.1-016:::::::*

OR	cpe:2.3:h:cisco:s195:-:::::::*
	cpe:2.3:h:cisco:s395:-:::::::*
	cpe:2.3:h:cisco:s695:-:::::::*
	cpe:2.3:h:cisco:web_security_appliance_s170:-:::::::*
	cpe:2.3:h:cisco:web_security_appliance_s190:-:::::::*
	cpe:2.3:h:cisco:web_security_appliance_s380:-:::::::*
	cpe:2.3:h:cisco:web_security_appliance_s390:-:::::::*
	cpe:2.3:h:cisco:web_security_appliance_s680:-:::::::*
	cpe:2.3:h:cisco:web_security_appliance_s690:-:::::::*
	cpe:2.3:h:cisco:web_security_appliance_s690x:-:::::::*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2023-24394	A vulnerability in the scanning engines of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass a configured rule, allowing traffic onto a network that should have been blocked. This vulnerability is due to improper detection of malicious traffic when the traffic is encoded with a specific content format. An attacker could exploit this vulnerability by using an affected device to connect to a malicious server and receiving crafted HTTP responses. A successful exploit could allow the attacker to bypass an explicit block rule and receive traffic that should have been rejected by the device.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.619% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-bypass-vXvqwzsj

History

No history.

Subscriptions

Cisco Asyncos S195 S395 S695 Web Security Appliance S170 Web Security Appliance S190 Web Security Appliance S380 Web Security Appliance S390 Web Security Appliance S680 Web Security Appliance S690 Web Security Appliance S690x

Weaknesses