CVE-2019-10150
Description
It was found that OpenShift Container Platform does not perform SSH Host Key checking when using ssh key authentication during builds. An attacker, with the ability to redirect network traffic, could use this to alter the resulting build output.
Statement
OpenShift Container Platform allows for various types of "source clone secrets" to be defined in order to permit building from non-public git repositories. When using ssh key authentication, the server host key checking function is disabled.
An attacker with the ability to redirect the network traffic and perform a "man in the middle" attack will be able to redirect the build job to use arbitrary content of their choosing.
Note that the same flaw (non-verification of remote server) is present when using HTTP, or when using HTTPS with TLS verification manually disabled.
Mitigation
Use only methods (such as HTTPS with TLS verification) that enable the identity of the remote repository to be validated.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | 5.9 | N/A |
| Attack Vector | Adjacent Network | Network | N/A |
| Attack Complexity | High | High | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | None | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | Low | None | N/A |
Vector
Red Hat: CVSS:3.0/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
NVD: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability,Access Control
Technical Impact: Read Application Data; Gain Privileges or Assume Identity; Execute Unauthorized Code or Commands
This weakness can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with sensitive information or even execute arbitrary code.
Acknowledgements
Red Hat would like to thank @l14n_uk for reporting this issue.
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