Bug 1869468 (CVE-2020-8620) - CVE-2020-8620 bind: A specially crafted large TCP payload can trigger an assertion failure in tcpdns.c
Summary: CVE-2020-8620 bind: A specially crafted large TCP payload can trigger an asse...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-8620
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
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Whiteboard:
Depends On:
Blocks: 1869469
TreeView+ depends on / blocked
 
Reported: 2020-08-18 04:39 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-02-16 19:29 UTC (History)
10 users (show)

Fixed In Version: bind 9.16.6, bind 9.17.4
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Last Closed: 2020-08-18 04:40:34 UTC
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Description Huzaifa S. Sidhpurwala 2020-08-18 04:39:33 UTC 
As per upstream advisory:

In versions of BIND that use the libuv network manager (9.16.x is the only stable branch affected) an incorrectly specified maximum buffer size allows a specially crafted large TCP payload to trigger an assertion failure when it is received.

An attacker who can establish a TCP connection with the server and send data on that connection can exploit this to trigger the assertion failure, causing the server to exit.
Comment 1 Huzaifa S. Sidhpurwala 2020-08-18 04:39:37 UTC 
Acknowledgments:

Name: ISC
Upstream: Emanuel Almeida (Cisco Systems, Inc)
Comment 2 Huzaifa S. Sidhpurwala 2020-08-18 04:39:40 UTC 
Statement:

This version only affects bind-9.16.x. Therefore versions of bind package shipped with Red Hat Enterprise Linux are not affected by this flaw.
Comment 3 Huzaifa S. Sidhpurwala 2020-08-21 02:16:04 UTC 
External References:

https://kb.isc.org/docs/cve-2020-8620
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