Vulnerability Name:

CVE-2019-18838 (CCN-173132)

Assigned:2019-11-08
Published:2019-11-08
Updated:2019-12-18
Summary:An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2019-18838

Source: MISC
Type: Product
https://blog.envoyproxy.io

Source: CCN
Type: Envoy Proxy Blog
The official Envoy Proxy Blog

Source: XF
Type: UNKNOWN
envoy-cve201918838-dos(173132)

Source: MISC
Type: Patch
https://github.com/envoyproxy/envoy/commits/master

Source: CCN
Type: envoy GIT Repository
DoS via request without the Host header

Source: CONFIRM
Type: Exploit, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc

Source: MISC
Type: Mailing List, Third Party Advisory
https://groups.google.com/forum/#!forum/envoy-users

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-18838

Vulnerable Configuration:Configuration 1:
  • cpe:/a:envoyproxy:envoy:*:*:*:*:*:*:*:* (Version <= 1.12.1)

    • Configuration CCN 1:
  • cpe:/a:envoyproxy:envoy:1.12.1:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:201918838
    V
    		CVE-2019-18838
    2022-05-22
    oval:org.opensuse.security:def:72909
    P
    		Security update for the Linux Kernel (Important)
    2020-12-01
    oval:org.opensuse.security:def:73027
    P
    		Add features for Metrics Server, Cert Status Checker, VSphere VCP, and Cilium Envoy (Moderate)
    2020-12-01
    BACK
    envoyproxy envoy *
    envoyproxy envoy 1.12.1