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    CVE-2018-20335

    An issue was discovered in ASUSWRT 3.0.0.4.384.20308. An unauthenticated user can trigger a DoS of the httpd service via the /APP_Installation.asp?= URI.

    Published:Mar 20, 2020
    Last Modified:Nov 21, 2024
    EPS:Mar 20, 2020
    EPSS Score:0.0167
    CVSS Score:7.5

    Affected Products

    Vendor
    Asus
    Product
    Asuswrt
    Vendor
    Asus
    Product
    Gt-ac2900
    Vendor
    Asus
    Product
    Gt-ac5300
    Vendor
    Asus
    Product
    Gt-ax11000
    Vendor
    Asus
    Product
    Rt-ac1200
    Vendor
    Asus
    Product
    Rt-ac1200 V2
    Vendor
    Asus
    Product
    Rt-ac1200g
    Vendor
    Asus
    Product
    Rt-ac1200ge
    Vendor
    Asus
    Product
    Rt-ac1750
    Vendor
    Asus
    Product
    Rt-ac1750 B1
    Vendor
    Asus
    Product
    Rt-ac1900p
    Vendor
    Asus
    Product
    Rt-ac3100
    Vendor
    Asus
    Product
    Rt-ac3200
    Vendor
    Asus
    Product
    Rt-ac51u
    Vendor
    Asus
    Product
    Rt-ac5300
    Vendor
    Asus
    Product
    Rt-ac55u
    Vendor
    Asus
    Product
    Rt-ac56r
    Vendor
    Asus
    Product
    Rt-ac56s
    Vendor
    Asus
    Product
    Rt-ac56u
    Vendor
    Asus
    Product
    Rt-ac66r
    Vendor
    Asus
    Product
    Rt-ac66u
    Vendor
    Asus
    Product
    Rt-ac66u-b1
    Vendor
    Asus
    Product
    Rt-ac66u B1
    Vendor
    Asus
    Product
    Rt-ac68p
    Vendor
    Asus
    Product
    Rt-ac68u
    Vendor
    Asus
    Product
    Rt-ac86u
    Vendor
    Asus
    Product
    Rt-ac87u
    Vendor
    Asus
    Product
    Rt-ac88u
    Vendor
    Asus
    Product
    Rt-acrh12
    Vendor
    Asus
    Product
    Rt-acrh13
    Vendor
    Asus
    Product
    Rt-ax3000
    Vendor
    Asus
    Product
    Rt-ax56u
    Vendor
    Asus
    Product
    Rt-ax58u
    Vendor
    Asus
    Product
    Rt-ax88u
    Vendor
    Asus
    Product
    Rt-ax92u
    Vendor
    Asus
    Product
    Rt-g32
    Vendor
    Asus
    Product
    Rt-n10\+d1
    Vendor
    Asus
    Product
    Rt-n10e
    Vendor
    Asus
    Product
    Rt-n14u
    Vendor
    Asus
    Product
    Rt-n16
    Vendor
    Asus
    Product
    Rt-n19
    Vendor
    Asus
    Product
    Rt-n56r
    Vendor
    Asus
    Product
    Rt-n56u
    Vendor
    Asus
    Product
    Rt-n600
    Vendor
    Asus
    Product
    Rt-n65u
    Vendor
    Asus
    Product
    Rt-n66r
    Vendor
    Asus
    Product
    Rt-n66u

    Exploits

    https://starlabs.sg/advisories/18-20335/https://starlabs.sg/advisories/18-20335/

    Common Weakness Enumeration

    CWE-20 Improper Input Validation

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2022-26376 (CVSS 9.8) — A memory corruption vulnerability exists in the httpd unescape functionality of Asuswrt prior to 3.0.0.4.386_4…
    CVE-2018-20333 (CVSS 7.5) — An issue was discovered in ASUSWRT 3.0.0.4.384.20308. An unauthenticated user can request /update_applist.asp …
    CVE-2018-20334 (CVSS 9.8) — An issue was discovered in ASUSWRT 3.0.0.4.384.20308. When processing the /start_apply.htm POST data, there is…
    CVE-2017-15653 (CVSS 8.8) — Improper administrator IP validation after his login in the HTTPd server in all current versions (<= 3.0.0.4.3…
    CVE-2017-15656 (CVSS 8.8) — Password are stored in plaintext in nvram in the HTTPd server in all current versions (<= 3.0.0.4.380.7743) of…
    CVE-2017-15654 (CVSS 8.3) — Highly predictable session tokens in the HTTPd server in all current versions (<= 3.0.0.4.380.7743) of Asus as…
    CVE-2017-15655 (CVSS 9.6) — Multiple buffer overflow vulnerabilities exist in the HTTPd server in Asus asuswrt version <=3.0.0.4.376.X. Al…
    CVE-2018-5999 (CVSS 9.8) — An issue was discovered in AsusWRT before 3.0.0.4.384_10007. In the handle_request function in router/httpd/ht…
    CVE-2018-6000 (CVSS 9.8) — An issue was discovered in AsusWRT before 3.0.0.4.384_10007. The do_vpnupload_post function in router/httpd/we…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High