Vulnerability Name:

CVE-2019-9900 (CCN-160238)

Assigned:2019-03-30
Published:2019-03-30
Updated:2022-01-01
Summary:When parsing HTTP/1.x header values, Envoy 1.9.0 and before does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.
CVSS v3 Severity:8.3 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L)
7.3 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): Low
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:U/RC:R)
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): Low
Availibility (A): None
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
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-74
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2019-9900

Source: REDHAT
Type: Third Party Advisory
RHSA-2019:0741

Source: XF
Type: UNKNOWN
envoy-cve20199900-sec-bypass(160238)

Source: CCN
Type: envoy GIT Repository
CVE-2019-9900 #6434

Source: CONFIRM
Type: Exploit, Issue Tracking, Third Party Advisory
https://github.com/envoyproxy/envoy/issues/6434

Source: CONFIRM
Type: Exploit, Mitigation, Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h

Source: CONFIRM
Type: Third Party Advisory
https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM

Source: CONFIRM
Type: Release Notes, Vendor Advisory
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-9900

Vulnerable Configuration:Configuration 1:
  • cpe:/a:envoyproxy:envoy:*:*:*:*:*:*:*:* (Version <= 1.9.0)

    • Configuration 2:
  • cpe:/a:redhat:openshift_service_mesh:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:envoyproxy:envoy:1.9.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    envoyproxy envoy *
    redhat openshift service mesh -
    envoyproxy envoy 1.9.0