CVE-2019-0211
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Description
A flaw was found in Apache where code executing in a less-privileged child process or thread could execute arbitrary code with the privilege of the parent process (usually root). An attacker having access to run arbitrary scripts on the web server (PHP, CGI etc) could use this flaw to run code on the web server with root privileges.
Statement
This flaw is exploitable in httpd if it is configured to allow an untrusted user to upload and execute arbitrary scripts. Due to the nature of the flaw, the uploaded script would not run as a restricted privileged user, but rather it runs as root allowing for privilege escalation from the restricted user to root on the web server.
Depending on the configuration of the server, you would need local (AV:L) privileges to place the script or network (AV:N) privileges if the server ran an application that permitted uploading scripts directly. The latter scenario is not common for unauthenticated users. Once the attacker can place the script somewhere in the web root where it can be easily exploited (AC:L). This type of setup is more common in shared hosted environments (PR:L) and would allow an attacker with access to a site on the shared hosted to impact the confidentiality, integrity, and availability (CIA:H) with no interaction (UI:N). Due to the elevated privileges obtained, there is an impact to the system beyond the web server itself (S:C).
Additional information
- Bugzilla 1694980: httpd: privilege escalation from modules scripts
- CWE-250: Execution with Unnecessary Privileges
- FAQ: Frequently asked questions about CVE-2019-0211
Common Vulnerability Scoring System (CVSS) Score Details
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).
Red Hat | NVD | |
---|---|---|
CVSS v3 Base Score | 8.8 | 7.8 |
Attack Vector | Local | Local |
Attack Complexity | Low | Low |
Privileges Required | Low | Low |
User Interaction | None | None |
Scope | Changed | Unchanged |
Confidentiality Impact | High | High |
Integrity Impact | High | High |
Availability Impact | High | High |
CVSS v3 Vector
Red Hat: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Frequently Asked Questions
Why is Red Hat's CVSS v3 score or Impact different from other vendors?
For more information, see https://access.redhat.com/solutions/762393.
My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?
- "Under investigation" doesn't necessarily mean that the product is affected by this vulnerability. It only means that our Analysis Team is still working on determining whether the product is affected and how it is affected.
- "Affected" means that our Analysis Team has determined that this product is affected by this vulnerability and might release a fix to address this in the near future.
What can I do if my product is listed as "Will not fix"?
Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
- Upgrade to a supported product version that includes a fix for this vulnerability (recommended).
- Apply a mitigation (if one exists).
- Open a support case to request a prioritization of releasing a fix for this vulnerability.
What can I do if my product is listed as "Fix deferred"?
Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
- Apply a mitigation (if one exists).
- Open a support case to request a prioritization of releasing a fix for this vulnerability.
- Red Hat Engineering focuses on addressing high-priority issues based on their complexity or limited lifecycle support. Therefore, lower-priority issues will not receive immediate fixes.
What is a mitigation?
I have a Red Hat product but it is not in the above list, is it affected?
Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?
My product is listed as "Out of Support Scope". What does this mean?
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