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CVE-2018-5743

HIGHCVSS 7.5/10EPSS 6.40%

Last modified

CVE-2018-5743 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. EPSS estimates a 6.40% chance of exploitation in the next 30 days.

Description

By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
6.40%

92.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
F5Big-Ip Local Traffic Manager>= 11.5.2, <= 11.6.5—
F5Big-Ip Local Traffic Manager>= 12.1.0, <= 12.1.4—
F5Big-Ip Local Traffic Manager>= 13.0.0, <= 13.1.1—
F5Big-Ip Local Traffic Manager>= 14.0.0, <= 14.1.0—
F5Big-Ip Local Traffic Manager15.0.0—
F5Big-Ip Application Acceleration Manager>= 11.5.2, <= 11.6.5—
F5Big-Ip Application Acceleration Manager>= 12.1.0, <= 12.1.4—
F5Big-Ip Application Acceleration Manager>= 13.0.0, <= 13.1.1—
F5Big-Ip Application Acceleration Manager>= 14.0.0, <= 14.1.0—
F5Big-Ip Application Acceleration Manager15.0.0—
F5Big-Ip Advanced Firewall Manager>= 11.5.2, <= 11.6.5—
F5Big-Ip Advanced Firewall Manager>= 12.1.0, <= 12.1.4—
F5Big-Ip Advanced Firewall Manager>= 13.1.0, <= 13.1.1—
F5Big-Ip Advanced Firewall Manager>= 14.0.0, <= 14.1.0—
F5Big-Ip Advanced Firewall Manager15.0.0—
F5Big-Ip Analytics>= 11.5.2, <= 11.6.5—
F5Big-Ip Analytics>= 12.1.0, <= 12.1.4—
F5Big-Ip Analytics>= 13.0.0, <= 13.1.1—
F5Big-Ip Analytics>= 14.0.0, <= 14.1.0—
F5Big-Ip Analytics15.0.0—
F5Big-Ip Access Policy Manager>= 11.5.2, <= 11.6.5—
F5Big-Ip Access Policy Manager>= 12.1.0, <= 12.1.4—
F5Big-Ip Access Policy Manager>= 13.1.0, <= 13.1.1—
F5Big-Ip Access Policy Manager>= 14.0.0, <= 14.1.0—
F5Big-Ip Access Policy Manager15.0.0—
F5Big-Ip Application Security Manager>= 11.5.2, <= 11.6.5—
F5Big-Ip Application Security Manager>= 12.1.0, <= 12.1.4—
F5Big-Ip Application Security Manager>= 13.0.0, <= 13.1.1—
F5Big-Ip Application Security Manager>= 14.0.0, <= 14.1.1—
F5Big-Ip Application Security Manager15.0.0—
F5Big-Ip Edge Gateway>= 11.5.2, <= 11.6.5—
F5Big-Ip Edge Gateway>= 12.1.0, <= 12.1.4—
F5Big-Ip Edge Gateway>= 13.0.0, <= 13.1.1—
F5Big-Ip Edge Gateway>= 14.0.0, <= 14.1.0—
F5Big-Ip Edge Gateway15.0.0—
F5Big-Ip Fraud Protection Service>= 11.5.2, <= 11.6.5—
F5Big-Ip Fraud Protection Service>= 12.1.0, <= 12.1.4—
F5Big-Ip Fraud Protection Service>= 13.0.0, <= 13.1.1—
F5Big-Ip Fraud Protection Service>= 14.0.0, <= 14.1.0—
F5Big-Ip Fraud Protection Service15.0.0—
F5Big-Ip Global Traffic Manager>= 11.5.2, <= 11.6.5—
F5Big-Ip Global Traffic Manager>= 12.1.0, <= 12.1.4—
F5Big-Ip Global Traffic Manager>= 13.0.0, <= 13.1.1—
F5Big-Ip Global Traffic Manager>= 14.0.0, <= 14.1.0—
F5Big-Ip Global Traffic Manager15.0.0—
F5Big-Ip Link Controller>= 11.5.2, <= 11.6.5—
F5Big-Ip Link Controller>= 12.1.0, <= 12.1.4—
F5Big-Ip Link Controller>= 13.0.0, <= 13.1.1—
F5Big-Ip Link Controller>= 14.0.0, <= 14.1.0—
F5Big-Ip Link Controller15.0.0—

Showing 50 of 77 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2018-5743?
By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.
How severe is CVE-2018-5743?
CVE-2018-5743 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 6.40% probability of exploitation in the next 30 days.
How do I fix CVE-2018-5743?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-5743?

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Source: NVD / NIST