8.3
HIGH
CVE-2019-9900
"Envoy HTTP Header Injection Vulnerability"
Description

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.

INFO

Published Date :

April 25, 2019, 3:29 p.m.

Last Modified :

Nov. 7, 2023, 3:13 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

3.7

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2019-9900 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2019-9900 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Envoyproxy envoy
1 Redhat openshift_service_mesh
: Total Affected Vendor : 2 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2019-9900.

URL Resource
https://access.redhat.com/errata/RHSA-2019:0741 Third Party Advisory
https://github.com/envoyproxy/envoy/issues/6434 Exploit Issue Tracking Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h Exploit Mitigation Third Party Advisory
https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history Release Notes Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
alphaSeclab/sec-daily-2019

2019年天融信阿尔法实验室在微信公众号发布的所有安全资讯汇总

Updated: 2 months, 3 weeks ago
33 stars 5 fork 5 watcher
Born at : Jan. 11, 2021, 2:13 a.m. This repo has been linked 240 different CVEs too.
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solo-io/envoy-cves

None

Makefile Go

Updated: 1 year, 3 months ago
11 stars 3 fork 3 watcher
Born at : April 4, 2019, 5 p.m. This repo has been linked 2 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2019-9900 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2019-9900 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM [No types assigned]
    Removed Reference MITRE https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM
  • Modified Analysis by [email protected]

    Jan. 01, 2022

    Action Type Old Value New Value
    Removed CVSS V3 NIST AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
    Changed Reference Type https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h No Types Assigned https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h Exploit, Mitigation, Third Party Advisory
    Removed CWE NIST CWE-20
    Added CPE Configuration OR *cpe:2.3:a:redhat:openshift_service_mesh:-:*:*:*:*:*:*:*
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE CWE-20 CWE-20 CWE-74
  • CVE Modified by [email protected]

    Nov. 12, 2019

    Action Type Old Value New Value
    Added Reference https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h [No Types Assigned]
  • CVE Modified by [email protected]

    Oct. 09, 2019

    Action Type Old Value New Value
    Added CVSS V3 MITRE AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
  • Initial Analysis by [email protected]

    May. 01, 2019

    Action Type Old Value New Value
    Added CVSS V2 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
    Changed Reference Type https://access.redhat.com/errata/RHSA-2019:0741 No Types Assigned https://access.redhat.com/errata/RHSA-2019:0741 Third Party Advisory
    Changed Reference Type https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history No Types Assigned https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history Release Notes, Vendor Advisory
    Changed Reference Type https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM No Types Assigned https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM Third Party Advisory
    Changed Reference Type https://github.com/envoyproxy/envoy/issues/6434 No Types Assigned https://github.com/envoyproxy/envoy/issues/6434 Exploit, Issue Tracking, Third Party Advisory
    Added CWE CWE-20
    Added CPE Configuration OR *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions up to (including) 1.9.0
  • CVE Modified by [email protected]

    Apr. 25, 2019

    Action Type Old Value New Value
    Added Reference https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM [No Types Assigned]
    Added Reference https://access.redhat.com/errata/RHSA-2019:0741 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2019-9900 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2019-9900 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-6: Argument Injection Argument Injection CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-34: HTTP Response Splitting HTTP Response Splitting CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-51: Poison Web Service Registry Poison Web Service Registry CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-83: XPath Injection XPath Injection CAPEC-84: XQuery Injection XQuery Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-105: HTTP Request Splitting HTTP Request Splitting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-250: XML Injection XML Injection CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-273: HTTP Response Smuggling HTTP Response Smuggling
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.49 }} 0.04%

score

0.76549

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
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Scope
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