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Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability

cisco-sa-sni-data-exfil-mFgzXqLN · Medium · Published · Updated

A vulnerability in the web filtering features of multiple Cisco products could allow an unauthenticated, remote attacker to bypass web reputation filters and threat detection mechanisms on an affected device and exfiltrate data from a compromised host to a blocked external server. This vulnerability is due to inadequate inspection of the Server Name Identification (SNI) header in the SSL/TLS handshake. An attacker could exploit this vulnerability by using data from the TLS client hello packet to communicate with a blocked external server. A successful exploit could be used to exfiltrate data from a protected network. The attacker must compromise a host on the network to exfiltrate the sensitive data. The following Snort rule can be used to detect possible exploitation of this vulnerability: Snort SID 58062. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sni-data-exfil-mFgzXqLN

Cisco advisory ·CSAF JSON

Workarounds

For potential workarounds on a specific Cisco product, refer to the Description section in the bug ID(s) at the top of this advisory.

CVEsCVE-2021-34749
Cisco Bug IDsCSCvy50873, CSCvy64824, CSCvy76771, CSCvz34379
CVSS ScoreBase 5.8
Base 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Product Names From Source
Cisco IOS, Cisco Secure Web Appliance, Cisco UTD SNORT IPS Engine Software, Cisco Firepower Threat Defense Software 6.2.3, Cisco Firepower Threat Defense Software 6.2.3.1, Cisco Firepower Threat Defense Software 6.2.3.2, Cisco Firepower Threat Defense Software 6.2.3.3, Cisco Firepower Threat Defense Software 6.2.3.4, Cisco Firepower Threat Defense Software 6.2.3.5, Cisco Firepower Threat Defense Software 6.2.3.6, Cisco Firepower Threat Defense Software 6.2.3.7, Cisco Firepower Threat Defense Software 6.2.3.8, Cisco Firepower Threat Defense Software 6.2.3.10, Cisco Firepower Threat Defense Software 6.2.3.11, Cisco Firepower Threat Defense Software 6.2.3.9, Cisco Firepower Threat Defense Software 6.2.3.12, Cisco Firepower Threat Defense Software 6.2.3.13, Cisco Firepower Threat Defense Software 6.2.3.14, Cisco Firepower Threat Defense Software 6.2.3.15, Cisco Firepower Threat Defense Software 6.2.3.16, Cisco Firepower Threat Defense Software 6.2.3.17, Cisco Firepower Threat Defense Software 6.6.0, Cisco Firepower Threat Defense Software 6.6.0.1, Cisco Firepower Threat Defense Software 6.6.1, Cisco Firepower Threat Defense Software 6.6.3, Cisco Firepower Threat Defense Software 6.6.4, Cisco Firepower Threat Defense Software 6.6.5, Cisco Firepower Threat Defense Software 6.4.0, Cisco Firepower Threat Defense Software 6.4.0.1, Cisco Firepower Threat Defense Software 6.4.0.3, Cisco Firepower Threat Defense Software 6.4.0.2, Cisco Firepower Threat Defense Software 6.4.0.4, Cisco Firepower Threat Defense Software 6.4.0.5, Cisco Firepower Threat Defense Software 6.4.0.6, Cisco Firepower Threat Defense Software 6.4.0.7, Cisco Firepower Threat Defense Software 6.4.0.8, Cisco Firepower Threat Defense Software 6.4.0.9, Cisco Firepower Threat Defense Software 6.4.0.10, Cisco Firepower Threat Defense Software 6.4.0.11, Cisco Firepower Threat Defense Software 6.4.0.12, Cisco Firepower Threat Defense Software 7.0.0, Cisco Firepower Threat Defense Software 7.0.0.1, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco ASA 5500-X Series Firewalls, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Secure Firewall Threat Defense Virtual

Related Products

Product CVE Evidence
Cisco UTD SNORT IPS Engine Software CVE-2021-34749 Cisco OpenVuln
Cisco Secure Web Appliance CVE-2021-34749 Cisco OpenVuln
Cisco Secure Firewall Threat Defense Virtual CVE-2021-34749 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2021-34749 Cisco OpenVuln
Cisco IOS CVE-2021-34749 Cisco OpenVuln
Cisco Firepower Threat Defense Software CVE-2021-34749 Cisco OpenVuln
Cisco Firepower 9000 Series CVE-2021-34749 Cisco OpenVuln
Cisco Firepower 4100 Series CVE-2021-34749 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2021-34749 Cisco OpenVuln
Cisco Firepower 1000 Series CVE-2021-34749 Cisco OpenVuln
Cisco ASA 5500-X Series Firewalls CVE-2021-34749 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2021-34749 Cisco OpenVuln