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CVE-2017-7494

Known exploitThis CVE is high risk and there are known public exploits
leveraging this vulnerability. Address this vulnerability with high priority.

Public on

Last Modified: UTC


ImportantImportant ImpactWhat does this mean?
7.5CVSS v3 Score Breakdown


INSIGHTS VULNERABILITY ANALYSIS

View exposed systems


DESCRIPTION

A remote code execution flaw was found in Samba. A malicious authenticated samba
client, having write access to the samba share, could use this flaw to execute
arbitrary code as root.

A remote code execution flaw was found in Samba. A malicious authenticated samba
client, having write access to the samba share, could use this flaw to execute
arbitrary code as root.


STATEMENT

This vulnerability exists in the samba server, client side packages are not
affected.

This vulnerability exists in the samba server, client side packages are not
affected.


MITIGATION

Any of the following:


1. SELinux is enabled by default and our default policy prevents loading of
modules from outside of samba's module directories and therefore blocks the
exploit


2. Mount the filesystem which is used by samba for its writable share using
"noexec" option.


3. Add the parameter:


    nt pipe support = no


    to the [global] section of your smb.conf and restart smbd. This prevents
clients from accessing any named pipe endpoints. Note this can disable some
expected functionality for Windows clients.



ADDITIONAL INFORMATION

 * Bugzilla 1450347: samba: Loading shared modules from any path in the system
   leading to RCE (SambaCry)
   
 * FAQ: Frequently asked questions about CVE-2017-7494




EXTERNAL REFERENCES

 * https://www.cve.org/CVERecord?id=CVE-2017-7494

 * https://nvd.nist.gov/vuln/detail/CVE-2017-7494

 * https://www.samba.org/samba/security/CVE-2017-7494.html

 * https://www.cisa.gov/known-exploited-vulnerabilities-catalog




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).

CVSS v3 Score BreakdownRed HatNVD

CVSS v3 Base Score

7.5

9.8

Attack Vector

Network

Network

Attack Complexity

High

Low

Privileges Required

Low

None

User Interaction

None

None

Scope

Unchanged

Unchanged

Confidentiality Impact

High

High

Integrity Impact

High

High

Availability Impact

High

High




CVSS V3 VECTOR

Red Hat: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H


ACKNOWLEDGEMENTS

Red Hat would like to thank the Samba project for reporting this issue. Upstream
acknowledges steelo as the original reporter.


FREQUENTLY ASKED QUESTIONS


WHY IS RED HAT'S CVSS V3 SCORE OR IMPACT DIFFERENT FROM OTHER VENDORS?

For open source software shipped by multiple vendors, the CVSS base scores may
vary for each vendor's version depending on the version they ship, how they ship
it, the platform, and even how the software is compiled. This makes scoring of
vulnerabilities difficult for third-party vulnerability databases such as NVD
that only provide a single CVSS base score for each vulnerability. Red Hat
scores reflect how a vulnerability affects our products specifically.

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"?

A "will not fix" status means that a fix for an affected product version is not
planned or not possible due to complexity, which may create additional risk.

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"?

A deferred status means that a fix for an affected product version is not
guaranteed due to higher-priority development work.

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?

A mitigation is an action that can be taken to reduce the impact of a security
vulnerability, without deploying any fixes.


I HAVE A RED HAT PRODUCT BUT IT IS NOT IN THE ABOVE LIST, IS IT AFFECTED?

The listed products were found to include one or more of the components that
this vulnerability affects. These products underwent a thorough evaluation to
determine their affectedness by this vulnerability. Note that layered products
(such as container-based offerings) that consume affected components from any of
the products listed in this table may be affected and are not represented.


WHY IS MY SECURITY SCANNER REPORTING MY PRODUCT AS VULNERABLE TO THIS
VULNERABILITY EVEN THOUGH MY PRODUCT VERSION IS FIXED OR NOT AFFECTED?

In order to maintain code stability and compatibility, Red Hat usually does not
rebase packages to entirely new versions. Instead, we backport fixes and new
features to an older version of the package we distribute. This can result in
some security scanners that only consider the package version to report the
package as vulnerable. To avoid this, we suggest that you use an approved
vulnerability scanner from our Red Hat Vulnerability Scanner Certification
program.

Not sure what something means? Check out our Security Glossary.

Want to get errata notifications? Sign up here.

This page is generated automatically and has not been checked for errors or
omissions.

For clarification or corrections please contact Red Hat Product Security.

Last Modified: UTC

CVE description copyright © 2021


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