CVE-2018-1111
Description
A command injection flaw was found in the NetworkManager integration script included in the DHCP client packages in Red Hat Enterprise Linux. A malicious DHCP server, or an attacker on the local network able to spoof DHCP responses, could use this flaw to execute arbitrary commands with root privileges on systems using NetworkManager and configured to obtain network configuration using the DHCP protocol.
Statement
Red Hat has been made aware of a vulnerability affecting the DHCP client packages as shipped with Red Hat Enterprise Linux 6 and 7. This vulnerability CVE-2018-1111 was rated as having a security impact of Critical. A malicious DHCP server, or an attacker on the local network able to spoof DHCP responses, could use this flaw to execute arbitrary commands with root privileges on systems using NetworkManager and configured to obtain network configuration using the DHCP protocol.
Red Hat Enterprise Virtualization 4.1 includes the vulnerable components, but the default configuration is not impacted because NetworkManager is turned off in the Management Appliance, and not used in conjunction with DHCP in the Hypervisor. Customers can still obtain the updated packages from Red Hat Enterprise Linux channels using yum update, or upgrade to Red Hat Enterprise Virtualization 4.2, which includes the fixed packages.
Red Hat Enterprise Virtualization 3.6 is not vulnerable as it does not use DHCP.
Mitigation
Please access https://access.redhat.com/security/vulnerabilities/3442151 for information on how to mitigate this issue.
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 | 7.5 | 7.5 | 7.5 |
| Attack Vector | Adjacent Network | Adjacent Network | Adjacent Network |
| Attack Complexity | High | High | High |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If a malicious user injects a character (such as a semi-colon) that delimits the end of one command and the beginning of another, it may be possible to then insert an entirely new and unrelated command that was not intended to be executed. This gives an attacker a privilege or capability that they would not otherwise have.
Acknowledgements
Red Hat would like to thank Felix Wilhelm (Google Security Team) for reporting this issue.
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