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Debian LTS: Security Advisory for unbound1.9 (DLA-2556-1)

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

1 year ago

Modified

Modified

1 year ago

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.

Common Vulnerabilities and Exposures (CVE)