CVE-2021-34749

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Summary

CVECVE-2021-34749
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-08-18 20:15:00 UTC
Updated2023-11-07 03:36:00 UTC
DescriptionA vulnerability in Server Name Identification (SNI) request filtering of Cisco Web Security Appliance (WSA), Cisco Firepower Threat Defense (FTD), and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from a compromised host. This vulnerability is due to inadequate filtering of the SSL handshake. An attacker could exploit this vulnerability by using data from the SSL client hello packet to communicate with an external server. A successful exploit could allow the attacker to execute a command-and-control attack on a compromised host and perform additional data exfiltration attacks.

Risk And Classification

Problem Types: CWE-200

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cisco Firepower Management Center 2.9.18 All All All
Operating System Cisco Firepower Management Center Virtual Appliance Firmware 6.6.0 All All All
Operating System Cisco Firepower Management Center Virtual Appliance Firmware 6.7.0 All All All
Operating System Cisco Firepower Management Center Virtual Appliance Firmware 7.0.0 All All All
Operating System Cisco Firepower Management Center Virtual Appliance Firmware 7.1.0 All All All
Application Cisco Ironport Web Security Appliance 14.5 All All All

References

ReferenceSourceLinkTags
Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability CISCO tools.cisco.com
Debian -- Security Information -- DSA-5354-1 snort DEBIAN www.debian.org
[SECURITY] [DLA 3317-1] snort security update MLIST lists.debian.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 181554 Debian Security Update for snort (DLA 3317-1)
  • 181678 Debian Security Update for snort (DSA 5354-1)
  • 317012 Cisco Web Security Appliance (WSA) Server Name Identification Data Exfiltration Vulnerability(cisco-sa-sni-data-exfil-mFgzXqLN)
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