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Debian LTS: Security Advisory for unbound1.9 (DLA-2556-1)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'unbound1.9' package(s) announced via the DLA-2556-1 advisory.
Insight
Insight
Several security vulnerabilities have been corrected in unbound, a validating, recursive, caching DNS resolver. Support for the unbound DNS server has been resumed, the sources can be found in the unbound1.9 source package. CVE-2020-12662 Unbound has Insufficient Control of Network Message Volume, aka an 'NXNSAttack' issue. This is triggered by random subdomains in the NSDNAME in NS records. CVE-2020-12663 Unbound has an infinite loop via malformed DNS answers received from upstream servers. CVE-2020-28935 Unbound contains a local vulnerability that would allow for a local symlink attack. When writing the PID file Unbound creates the file if it is not there, or opens an existing file for writing. In case the file was already present, it would follow symlinks if the file happened to be a symlink instead of a regular file.
Affected Software
Affected Software
'unbound1.9' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
For Debian 9 stretch, these problems have been fixed in version 1.9.0-2+deb10u2~deb9u1. We recommend that you upgrade your unbound1.9 packages.