unbound: Vulnerability in IPSEC module (CVE-2019-18934)

Unbound 1.6.4 through 1.9.4 contain a vulnerability in the ipsec module that can cause shell code execution after receiving a specially crafted answer. This issue can only be triggered if unbound was compiled with --enable-ipsecmod support, and ipsecmod is enabled and used in the configuration.

References:

https://www.nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txt
https://www.openwall.com/lists/oss-security/2019/11/19/1
https://nvd.nist.gov/vuln/detail/CVE-2019-18934

Affected branches:

• master (05257282)
• 3.10-stable (407d97af )
• 3.9-stable (85b36404)
• 3.8-stable (ae112bcb)