Security Bulletin - Web Gateway updates fix four vulnerabilities (CVE-2019-3581, CVE-2018-11784, CVE-2018-12327, and CVE-2018-7170)
Security Bulletins ID:
SB10264
Last Modified: 2022-05-04 15:33:19 Etc/GMT
Last Modified: 2022-05-04 15:33:19 Etc/GMT
Summary
First Published: January 8, 2019
Article contents:
These updates resolve all of the following vulnerabilities.
CVE-2019-3581:
An unauthenticated user can cause a denial of service attack against the proxy component of Web Gateway.
NOTE: The following link was not yet populated with CVE details at the time of publication of this Security Bulletin.
https://nvd.nist.gov/vuln/detail/CVE-2019-3581
CVE-2018-11784:
When the default servlet in Apache Tomcat returned a redirect to a directory (for example, redirecting to '/foo/' when the user requested '/foo') a specially crafted URL could be used to cause the redirect to be generated to any URI of the attacker's choice.
https://nvd.nist.gov/vuln/detail/CVE-2018-11784
CVE-2018-12327:
The ntpq and ntpdc command-line utilities that are part of the ntp package are vulnerable to stack-based buffer overflow via crafted hostname. Applications using these vulnerable utilities with an untrusted input may be potentially exploited, resulting in a crash or arbitrary code execution under privileges of that application.
https://nvd.nist.gov/vuln/detail/CVE-2018-12327
CVE-2018-7170:
A flaw was found in ntpd making it vulnerable to Sybil attacks. An authenticated attacker could target systems configured to use a trusted key in certain configurations and to create an arbitrary number of associations and subsequently modify a victim's clock.
https://nvd.nist.gov/vuln/detail/CVE-2018-7170
Remediation
To remediate this issue, go to the Product Downloads site, and download the applicable product release file:
Download and Installation Instructions
For instructions to download product updates and hotfixes, see KB56057 - How to download Enterprise product updates and documentation. Review the Release Notes and the Installation Guide for instructions on how to install these updates. All documentation is available on the Product Documentation site.
Workaround
CVE-2019-3581:
An administrator can adjust the policy to include a rule at the top of the rule tree to completely eliminate the risk:
CVE-2018-11784: None
CVE-2018-12327: None
CVE-2018-7170: None
Installing the provided release specified in the Remediation table is strongly encouraged.
Acknowledgments
Vulnerability CVE-2018-11784 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-11784
Vulnerability CVE-2018-12327 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-12327
Vulnerability CVE-2018-7170 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-7170
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable?
For Appliances:
Use the following instructions for Appliance-based products:
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council's effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website at: http://www.first.org/cvss/.
When calculating CVSS scores, we've adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by the successful exploitation of the issue being scored.
What are the CVSS scoring metrics?
All Security Bulletins are published on our Knowledge Center. Security Bulletins are retired (removed) once a product is both End of Sale and End of Support (End of Life).
How do I report a product vulnerability to you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you respond to this and any other reported security flaws?
Our key priority is the security of our customers. If a vulnerability is found within any of our software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan.
We only publish Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't allow the exclusion or limitation of liability for consequential or incidental damages, so the preceding limitation may not apply.
Any future product release dates mentioned in this Security Bulletin are intended to outline our general product direction, and they shouldn't be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates aren't a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remain at our sole discretion and may be changed or canceled at any time.
| Impact of Vulnerability: | CVE-2019-3581: Improper input validation CVE-2018-11784: Improper control of resource identifiers CVE-2018-12327: Stack based buffer overflow CVE-2018-7170: |
| CVE ID: | CVE-2019-3581 CVE-2018-11784 CVE-2018-12327 CVE-2018-7170 |
| Severity Rating: | CVE-2019-3581: High CVE-2018-11784: Medium CVE-2018-12327: High CVE-2018-7170: Low |
| CVSS v3 Base/Temporal Scores: | CVE-2019-3581: 7.5 / 7.2 CVE-2018-11784: 4.3 / 4.1 CVE-2018-12327: 7.0 / 6.7 CVE-2018-7170: 3.1 / 3.0 |
| Recommendations: | Install or update to Web Gateway (MWG) 7.7.2.19 Install or update to MWG 7.8.2.5 (Main Release) Install or update to MWG 8.0.2 (Controlled Release) |
| Security Bulletin Replacement: | None |
| Affected Software: | CVE-2019-3581:
|
| Location of updated software: | Product Downloads site |
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Article contents:
- Vulnerability Description
- Remediation
- Workaround
- Acknowledgments
- Frequently Asked Questions (FAQs)
- Resources
- Disclaimer
These updates resolve all of the following vulnerabilities.
CVE-2019-3581:
An unauthenticated user can cause a denial of service attack against the proxy component of Web Gateway.
NOTE: The following link was not yet populated with CVE details at the time of publication of this Security Bulletin.
https://nvd.nist.gov/vuln/detail/CVE-2019-3581
CVE-2018-11784:
When the default servlet in Apache Tomcat returned a redirect to a directory (for example, redirecting to '/foo/' when the user requested '/foo') a specially crafted URL could be used to cause the redirect to be generated to any URI of the attacker's choice.
https://nvd.nist.gov/vuln/detail/CVE-2018-11784
CVE-2018-12327:
The ntpq and ntpdc command-line utilities that are part of the ntp package are vulnerable to stack-based buffer overflow via crafted hostname. Applications using these vulnerable utilities with an untrusted input may be potentially exploited, resulting in a crash or arbitrary code execution under privileges of that application.
https://nvd.nist.gov/vuln/detail/CVE-2018-12327
CVE-2018-7170:
A flaw was found in ntpd making it vulnerable to Sybil attacks. An authenticated attacker could target systems configured to use a trusted key in certain configurations and to create an arbitrary number of associations and subsequently modify a victim's clock.
https://nvd.nist.gov/vuln/detail/CVE-2018-7170
Remediation
To remediate this issue, go to the Product Downloads site, and download the applicable product release file:
| Product | Type | Version | File Name | Release Date |
| MWG 7.7.2 | Update | 7.7.2.19 | mwgappl-7.7.2.19.0-27616-x.86_64.iso | January 8, 2019 |
| MWG 7.8.2 | Main Release | 7.8.2.5 | mwgappl-7.8.2.5.0-27615-x.86_64.iso | January 8, 2019 |
| MWG 8.0 | Controlled Release | 8.0.2 | mwgappl-8.0.2-27614-x.86_64.iso | January 8, 2019 |
Download and Installation Instructions
For instructions to download product updates and hotfixes, see KB56057 - How to download Enterprise product updates and documentation. Review the Release Notes and the Installation Guide for instructions on how to install these updates. All documentation is available on the Product Documentation site.
Workaround
CVE-2019-3581:
An administrator can adjust the policy to include a rule at the top of the rule tree to completely eliminate the risk:
Condition: String.Length (URL.Host) greater than 254
Action: Block
Applies to: Requests (and IM)
Action: Block
Applies to: Requests (and IM)
CVE-2018-11784: None
CVE-2018-12327: None
CVE-2018-7170: None
Installing the provided release specified in the Remediation table is strongly encouraged.
Acknowledgments
Vulnerability CVE-2018-11784 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-11784
Vulnerability CVE-2018-12327 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-12327
Vulnerability CVE-2018-7170 was reported by Red Hat:
https://access.redhat.com/security/cve/cve-2018-7170
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable?
For Appliances:
Use the following instructions for Appliance-based products:
- Open the Administrator's User Interface (UI).
- Click the About link. The product version displays.
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council's effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website at: http://www.first.org/cvss/.
When calculating CVSS scores, we've adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by the successful exploitation of the issue being scored.
What are the CVSS scoring metrics?
- CVE-2019-3581
Base Score 7.5 Attack Vector (AV) Network (N) Attack Complexity (AC) Low (L) Privileges Required (PR) None (N) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) None (N) Availability (A) High (H) Temporal Score (Overall) 7.2 Exploitability (E) Not Defined (X) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Not Defined (X)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:O
- CVE-2018-11784
Base Score 4.3 Attack Vector (AV) Network (N) Attack Complexity (AC) Low (L) Privileges Required (PR) None (N) User Interaction (UI) Required (R) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) Low (L) Availability (A) None (N) Temporal Score (Overall) 4.1 Exploitability (E) Not Defined (X) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Not Defined (X)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/RL:O
- CVE-2018-12327
Base Score 7.0 Attack Vector (AV) Local (L) Attack Complexity (AC) High (H) Privileges Required (PR) None (N) User Interaction (UI) Required (R) Scope (S) Unchanged (U) Confidentiality (C) High (H) Integrity (I) High (H) Availability (A) High (H) Temporal Score (Overall) 6.7 Exploitability (E) Not Defined (X) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Not Defined (X)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/RL:O
- CVE-2018-7170
Base Score 3.1 Attack Vector (AV) Network (N) Attack Complexity (AC) High (H) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) Low (L) Availability (A) None (N) Temporal Score (Overall) 3.0 Exploitability (E) Not Defined (X) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Not Defined (X)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/RL:O
All Security Bulletins are published on our Knowledge Center. Security Bulletins are retired (removed) once a product is both End of Sale and End of Support (End of Life).
How do I report a product vulnerability to you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you respond to this and any other reported security flaws?
Our key priority is the security of our customers. If a vulnerability is found within any of our software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan.
We only publish Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
To contact Technical Support, go to the Create a Service Request page and log on to the ServicePortal.
- If you are a registered user, type your User ID and Password, and then click Log In.
- If you are not a registered user, click Register and complete the fields to have your password and instructions emailed to you.
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't allow the exclusion or limitation of liability for consequential or incidental damages, so the preceding limitation may not apply.
Any future product release dates mentioned in this Security Bulletin are intended to outline our general product direction, and they shouldn't be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates aren't a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remain at our sole discretion and may be changed or canceled at any time.
