cbcvebase.
CVE-2020-3452
published 2020-07-22

CVE-2020-3452: A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow…

PriorityP190high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
KEVITWEXPLOITInitial access
CISA Known Exploited Vulnerabilitydue 2022-05-03
Exploited in the wild
EPSS
99.99%
100.0th percentile
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct directory traversal attacks and read sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of URLs in HTTP requests processed by an affected device. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device. The web services file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability cannot be used to obtain access to ASA or FTD system files or underlying operating system (OS) files.

Affected

19 ranges
VendorProductVersion rangeFixed in
ciscoadaptive_security_appliance
ciscoadaptive_security_appliance_software>= 9.10 < 9.10.1.429.10.1.42
ciscoadaptive_security_appliance_software>= 9.12 < 9.12.3.129.12.3.12
ciscoadaptive_security_appliance_software>= 9.13 < 9.13.1.109.13.1.10
ciscoadaptive_security_appliance_software>= 9.14 < 9.14.1.109.14.1.10
ciscoadaptive_security_appliance_software>= 9.6 < 9.6.4.429.6.4.42
ciscoadaptive_security_appliance_software>= 9.8 < 9.8.4.209.8.4.20
ciscoadaptive_security_appliance_software>= 9.9 < 9.9.2.749.9.2.74
ciscocisco_adaptive_security_appliance_software>= unspecified < 9.6.4.429.6.4.42
ciscocisco_adaptive_security_appliance_software>= unspecified < 9.8.4.209.8.4.20
ciscocisco_adaptive_security_appliance_software>= unspecified < 9.9.2.749.9.2.74
ciscocisco_adaptive_security_appliance_software>= unspecified < 9.10.1.429.10.1.42
ciscocisco_adaptive_security_appliance_software>= unspecified < 9.13.1.109.13.1.10
ciscocisco_adaptive_security_appliance_software>= unspecified < 9.14.1.109.14.1.10
ciscofirepower_threat_defense>= 6.2.3 < 6.2.3.166.2.3.16
ciscofirepower_threat_defense>= 6.3.0 < 6.3.0.66.3.0.6
ciscofirepower_threat_defense>= 6.4.0 < 6.4.0.106.4.0.10
ciscofirepower_threat_defense>= 6.5.0 < 6.5.0.56.5.0.5
ciscofirepower_threat_defense>= 6.6.0 < 6.6.0.16.6.0.1

Detection & IOCsextracted from sources · hover to see the quote

url/+CSCOT+/translation-table?type=mst&textdomain=/%2bCSCOE%2b/portal_inc.lua&default-language&lang=../
url/+CSCOT+/oem-customization?app=AnyConnect&type=oem&platform=..&resource-type=..&name=%2bCSCOE%2b/portal_inc.lua
path/+CSCOE+/logon.html
cookieCookie: token=..//+CSCOU+/$delete
path/+CSCOE+/session_password.html
url/+webvpn+/index.html
yara
matchers: words: ["INTERNAL_PASSWORD_ENABLED", "CONF_VIRTUAL_KEYBOARD"] condition: and
  • Exploit attempts can be detected by monitoring HTTP GET requests to the /+CSCOT+/translation-table or /+CSCOT+/oem-customization endpoints containing directory traversal sequences (%2b, ../) targeting the web services file system.
  • Successful exploitation of CVE-2020-3452 results in HTTP responses containing the strings 'INTERNAL_PASSWORD_ENABLED' and 'CONF_VIRTUAL_KEYBOARD' from the portal_inc.lua file — use these as response body match conditions.
  • The CVE-2020-3187 (file deletion) exploit uses a crafted Cookie header with traversal path 'token=..//+CSCOU+/<filename>' sent to /+CSCOE+/session_password.html — monitor for this cookie pattern in HTTP requests.
  • Check Point IPS signature 'Cisco Adaptive Security Appliance Directory Traversal (CVE-2020-3452)' provides network-level detection for exploitation attempts.
  • ·The vulnerability is only exploitable when WebVPN or AnyConnect features are configured on the device — systems without these features enabled are not affected.
  • ·The path traversal is limited to the web services file system (RamFS); it cannot be used to read ASA/FTD system files or underlying OS files.
  • ·Cisco ASA releases 9.5 and earlier, and release 9.7, have reached end of software maintenance and will not receive patches — customers must migrate to a supported release.

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N
vulncheck7.5HIGH
cisa7.5HIGH
vendor_cisco7.5HIGH
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