Allele Security Alert
ASA-2019-00234
Identifier(s)
ASA-2019-00234, CVE-2018-5743
Title
Limiting simultaneous TCP clients is ineffective
Vendor(s)
Internet Systems Consortium (ISC)
Product(s)
BIND
Affected version(s)
BIND 9.9.0 to 9.10.8-P1
BIND 9.11.0 to 9.11.6
BIND 9.12.0 to 9.12.4
BIND 9.14.0
BIND Supported Preview Edition 9.9.3-S1 to 9.11.5-S3
BIND Supported Preview Edition 9.11.5-S5
BIND 9.13.0 to 9.13.7
Fixed version(s)
BIND 9.11.6-P1
BIND 9.12.4-P1
BIND 9.14.1
BIND Supported Preview Edition 9.11.5-S6
BIND Supported Preview Edition 9.11.6-S1
Proof of concept
Unknown
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 contains an error which can be exploited to grow the number of simultaneous connections beyond this limit.
Technical details
Unknown
Credits
AT&T
Reference(s)
CVE-2018-5743: Limiting simultaneous TCP clients is ineffective
https://kb.isc.org/docs/cve-2018-5743
CVE-2018-5743
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5743
CVE-2018-5743
https://nvd.nist.gov/vuln/detail/CVE-2018-5743
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Last modified: April 27, 2019