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AUSCERT External Security Bulletin Redistribution
ESB-2019.4438
Unbound: RCE vulnerability patched in IPSEC module
25 November 2019
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AusCERT Security Bulletin Summary
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Product: Unbound
Publisher: NLNet Labs
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18934
Original Bulletin:
https://nlnetlabs.nl/projects/unbound/security-advisories/#vulnerability-in-ipsec-module
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Vulnerability in IPSEC module
Date: 2019-11-19
CVE: CVE-2019-18934
Credit: X41 D-Sec
Affects: Unbound 1.6.4 up to and including version 1.9.4
Not affected: Other versions
Severity: Critical
Impact: Shell code execution after a specially crafted answer
Solution: Download patched version of Unbound, or apply the patch manually
Due to unsanitized characters passed to the ipsecmod-hook shell command, it is
possible for Unbound to allow shell code execution from a specially crafted
IPSECKEY answer.
This issue can only be triggered when all of the below conditions are met:
* unbound was compiled with --enable-ipsecmod support, and
* ipsecmod is enabled and used in the configuration (either in the
configuration file or using unbound-control), and
* a domain is part of the ipsecmod-whitelist (if ipsecmod-whitelist is used),
and
* unbound receives an A/AAAA query for a domain that has an A/AAAA record(s)
and an IPSECKEY record(s) available.
The shell code execution can then happen if either the qname or the gateway
field of the IPSECKEY (when gateway type == 3) contain a specially crafted
domain name.
Unbound 1.9.5 contains a patch. If you cannot upgrade you can also apply the
patch manually. To do this, apply the patch on Unbound source directory with
patch -p1 < filename, then run make install to install Unbound.
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