Vulnerability Name:

CVE-2019-18801 (CCN-172884)

Assigned:2019-12-10
Published:2019-12-10
Updated:2020-08-24
Summary:An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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): High
Integrity (I): High
Availibility (A): High
9.0 Critical (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)
7.8 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
7.6 High (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-787
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2019-18801

Source: MISC
Type: Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4222

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

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

Source: CCN
Type: Ambassador Blog, Dec 10
Untrusted remote client vulnerabilities in Envoy Proxy

Source: XF
Type: UNKNOWN
envoy-cve201918801-bo(172884)

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

Source: CONFIRM
Type: Exploit, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-gxvv-x4p2-rppp

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

Source: CCN
Type: ISTIO-SECURITY-2019-007
Security Bulletin

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

    • Configuration CCN 1:
  • cpe:/a:istio:istio:1.2.3:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.0:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.1:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.2:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.4:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.5:*:*:*:*:*:*:*
  • OR cpe:/a:envoyproxy:envoy:1.12.0:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.3.4:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.6:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.7:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.8:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.2.9:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.3.0:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.3.1:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.3.2:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.3.3:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.3.5:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.4.0:*:*:*:*:*:*:*
  • OR cpe:/a:istio:istio:1.4.1:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:201918801
    V
    		CVE-2019-18801
    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 *
    istio istio 1.2.3
    istio istio 1.2.0
    istio istio 1.2.1
    istio istio 1.2.2
    istio istio 1.2.4
    istio istio 1.2.5
    envoyproxy envoy 1.12.0
    istio istio 1.3.4
    istio istio 1.2.6
    istio istio 1.2.7
    istio istio 1.2.8
    istio istio 1.2.9
    istio istio 1.3.0
    istio istio 1.3.1
    istio istio 1.3.2
    istio istio 1.3.3
    istio istio 1.3.5
    istio istio 1.4.0
    istio istio 1.4.1