CVE-2018-5744: A specially crafted packet can cause named to leak memory
Michael McNally
mcnally at isc.org
Thu Feb 21 23:03:51 UTC 2019
CVE: CVE-2018-5744
Document version: 2.0
Posting date: 21 February 2019
Program impacted: BIND
Versions affected: BIND 9.10.7 -> 9.10.8-P1, 9.11.3 -> 9.11.5-P1,
9.12.0 -> 9.12.3-P1, and versions 9.10.7-S1 ->
9.11.5-S3
of BIND 9 Supported Preview Edition. Versions 9.13.0 ->
9.13.5-W1 of the 9.13 development branch are also
affected.
Severity: High
Exploitable: Remotely
Description:
A failure to free memory can occur when processing messages
having a specific combination of EDNS options.
Impact:
By exploiting this condition, an attacker can potentially cause
named's memory use to grow without bounds until all memory
available to the process is exhausted. Typically a server process
is limited as to the amount of memory it can use but if the named
process is not limited by the operating system all free memory
on the server could be exhausted.
CVSS Score: 7.5
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
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.
Workarounds: None.
Active exploits: None known.
Solution:
Upgrade to a version of BIND containing a fix for the memory leak.
+ BIND 9.11.5-P4
+ BIND 9.12.3-P4
BIND Supported Preview Edition is a special feature preview
branch of BIND provided to eligible ISC support customers.
+ BIND 9.11.5-S5
Acknowledgements:
ISC would like to thank Toshifumi Sakaguchi for reporting this issue
to us.
Document revision history:
1.0 Advance Notification, 16 January 2019
2.0 Public Disclosure, 21 February 2019
Related documents:
See our BIND 9 Security Vulnerability Matrix for a complete
listing of security vulnerabilities and versions affected.
Do you still have questions? Questions regarding this advisory
should go to security-officer at isc.org. To report a new issue, please
encrypt your message using security-officer at isc.org's PGP key which
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https://www.isc.org/downloads/software-support-policy/openpgp-key/.
If you are unable to use encrypted email, you may also report new
issues at: https://www.isc.org/community/report-bug/.
Note:
ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on which
versions are actively supported, please see
https://www.isc.org/downloads/.)
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can
be found in the ISC Software Defect and Security Vulnerability
Disclosure Policy.
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