CVE-2020-3187CWE-22path-traversal

CVE-2020-3187

Critical · published May 6, 2020

Patch now

High probability of exploitation

CVSS calls it critical at 9.1. It sits in the 99.9th percentile for exploit probability.

CVSS v3.1
9.1
EPSS
97%
Percentile
99.9
In the wild
Unconfirmed
What it is

🚨 An attacker could exploit this with a simple crafted HTTP request! The lack of input validation in Cisco's ASA and FTD software exposes a dangerous directory traversal vulnerability. 🔥 Think of it as a hotel manager who never checks the guest list — anyone could waltz into the back office, peek at sensitive documents, or even remove valuable files without a second thought! This vulnerability could allow an unauthenticated attacker to read or even delete sensitive files on your network, potentially exposing critical information or causing data loss. While the files are restored upon device reboot, the disruption and potential data exposure during the attack can be absolutely devastating!

Put simply

Think of it as a hotel manager who never checks the guest list — anyone could waltz into the back office, peek at sensitive documents, or even remove valuable files without a second thought! The vulnerability occurs due to improper validation of HTTP URLs, enabling directory traversal attacks that allow viewing or deleting files within the web services file system when WebVPN or AnyConnect features are enabled.

What to do

This vulnerability could allow an unauthenticated attacker to read or even delete sensitive files on your network, potentially exposing critical information or causing data loss. While the files are restored upon device reboot, the disruption and potential data exposure during the attack can be absolutely devastating! To protect your systems, immediately update your Cisco ASA or FTD software to the latest version where this issue is patched. Additionally, review your configurations to limit access to the web services file system and implement stringent input validation measures. You're on the right track! Follow these steps, and you'll fortify your defenses in no time. 🛡️

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.96595 · 99.9th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2020-05-06T21:15Z
Affected products (22)
ProductVersionsFixed in
cisco/secure_firewall_threat_defense≥ 6.2.3, < 6.2.3.166.2.3.16
cisco/secure_firewall_threat_defense≥ 6.3.0, < 6.3.0.66.3.0.6
cisco/secure_firewall_threat_defense≥ 6.4.0, < 6.4.0.86.4.0.8
cisco/secure_firewall_threat_defense≥ 6.5.0, < 6.5.0.46.5.0.4
cisco/asa_5505_firmwareall versions—
cisco/asa_5510_firmwareall versions—
cisco/asa_5512-x_firmwareall versions—
cisco/asa_5515-x_firmwareall versions—
cisco/asa_5520_firmwareall versions—
cisco/asa_5525-x_firmwareall versions—
cisco/asa_5540_firmwareall versions—
cisco/asa_5545-x_firmwareall versions—
cisco/asa_5550_firmwareall versions—
cisco/asa_5555-x_firmwareall versions—
cisco/asa_5580_firmwareall versions—
cisco/asa_5585-x_firmwareall versions—
cisco/adaptive_security_appliance_software≥ 9.6, < 9.6.4.409.6.4.40
cisco/adaptive_security_appliance_software≥ 9.8, < 9.8.4.159.8.4.15
cisco/adaptive_security_appliance_software≥ 9.9, < 9.9.2.669.9.2.66
cisco/adaptive_security_appliance_software≥ 9.10, < 9.10.1.379.10.1.37
cisco/adaptive_security_appliance_software≥ 9.12, < 9.12.3.29.12.3.2
cisco/adaptive_security_appliance_software≥ 9.13, < 9.13.1.79.13.1.7
References (4)
EPSS history
Timeline
  • 06 MAY 16:41Z
    Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Path Traversal Vulnerability
    cvelistv5