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Debian LTS: Security Advisory for bind9 (DLA-2807-1)

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

10 months ago

Modified

Modified

10 months ago

Summary

The remote host is missing an update for the 'bind9' package(s) announced via the DLA-2807-1 advisory.

Insight

Insight

CVE-2021-25219 Kishore Kumar Kothapalli discovered that the lame server cache in BIND, a DNS server implementation, can be abused by an attacker to significantly degrade resolver performance, resulting in denial of service (large delays for responses for client queries and DNS timeouts on client hosts). CVE-2018-5740 'deny-answer-aliases' is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c.

Affected Software

Affected Software

'bind9' 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 1:9.10.3.dfsg.P4-12.3+deb9u10. We recommend that you upgrade your bind9 packages.

Common Vulnerabilities and Exposures (CVE)