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CVE-2020-3187

CRITICALCVSS 9.1/10EPSS 96.59%

Last modified

CVE-2020-3187 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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 obtain read and delete access to sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of the HTTP URL. EPSS estimates a 96.59% chance of exploitation in the next 30 days.

Description

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 obtain read and delete access to sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences. An exploit could allow the attacker to view or delete arbitrary files on the targeted system. When the device is reloaded after exploitation of this vulnerability, any files that were deleted are restored. The attacker can only view and delete files within the web services file system. This file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability can not be used to obtain access to ASA or FTD system files or underlying operating system (OS) files. Reloading the affected device will restore all files within the web services file system.

Metrics

CVSS 3.1
9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability
96.59%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFirepower Threat Defense>= 6.2.3, < 6.2.3.16
CiscoFirepower Threat Defense>= 6.3.0, < 6.3.0.6
CiscoFirepower Threat Defense>= 6.4.0, < 6.4.0.8
CiscoFirepower Threat Defense>= 6.5.0, < 6.5.0.4
CiscoAsa 5505 Firmware9.6\(4\)
CiscoAsa 5510 Firmware9.6\(4\)
CiscoAsa 5512-X Firmware9.6\(4\)
CiscoAsa 5515-X Firmware9.6\(4\)
CiscoAsa 5520 Firmware9.6\(4\)
CiscoAsa 5525-X Firmware9.6\(4\)
CiscoAsa 5540 Firmware9.6\(4\)
CiscoAsa 5545-X Firmware9.6\(4\)
CiscoAsa 5550 Firmware9.6\(4\)
CiscoAsa 5555-X Firmware9.6\(4\)
CiscoAsa 5580 Firmware9.6\(4\)
CiscoAsa 5585-X Firmware9.6\(4\)
CiscoAdaptive Security Appliance Software>= 9.6, < 9.6.4.40
CiscoAdaptive Security Appliance Software>= 9.8, < 9.8.4.15
CiscoAdaptive Security Appliance Software>= 9.9, < 9.9.2.66
CiscoAdaptive Security Appliance Software>= 9.10, < 9.10.1.37
CiscoAdaptive Security Appliance Software>= 9.12, < 9.12.3.2
CiscoAdaptive Security Appliance Software>= 9.13, < 9.13.1.7

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-3187?
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 obtain read and delete access to sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences. An exploit could allow the attacker to view or delete arbitrary files on the targeted system. When the device is reloaded after exploitation of this vulnerability, any files that were deleted are restored. The attacker can only view and delete files within the web services file system. This file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability can not be used to obtain access to ASA or FTD system files or underlying operating system (OS) files. Reloading the affected device will restore all files within the web services file system.
How severe is CVE-2020-3187?
CVE-2020-3187 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 96.59% probability of exploitation in the next 30 days.
How do I fix CVE-2020-3187?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3187?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST