PT-2020-5766 · Isc+8 · Bind 9+8
Published
2020-08-20
·
Updated
2024-06-15
·
CVE-2020-8622
CVSS v3.1
6.5
Medium
| Vector | AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
BIND 9 versions 9.0.0 through 9.11.21
BIND 9 versions 9.12.0 through 9.16.5
BIND 9 versions 9.17.0 through 9.17.3
BIND 9 Supported Preview Edition versions 9.9.3-S1 through 9.11.21-S1
Description:
The issue is related to an assertion failure when attempting to verify a truncated response to a TSIG-signed request. This can be triggered by an attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, who sends a truncated response. An off-path attacker would have to correctly guess when a TSIG-signed request was sent and spoof a truncated response to trigger the assertion failure. The exploitation of this issue can cause the server to exit, resulting in a denial of service.
Recommendations:
For BIND 9 versions 9.0.0 through 9.11.21, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.12.0 through 9.16.5, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.17.0 through 9.17.3, update to a version outside of this range to resolve the issue.
For BIND 9 Supported Preview Edition versions 9.9.3-S1 through 9.11.21-S1, update to a version outside of this range to resolve the issue.
As a temporary workaround, consider restricting access to TSIG-signed requests until a patch is available.
Exploit
Fix
DoS
Assertion Failure
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Bind 9
Bind Server
Centos
Ibm Aix
Linuxmint
Red Hat
Suse
Ubuntu