dbcve.org
FedoraOperating system · Fedoraproject

CVE-2017-9105

HIGH · 8.8 CVSS v3.1 Published 2020-06-18
Fix available
A fix is available. Upgrade to 1.5.2 or later.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An issue was discovered in adns before 1.5.2. It corrupts a pointer when a nameserver speaks first because of a wrong number of pointer dereferences. This bug may well be exploitable as a remote code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

adns before version 1.5.2 contains a pointer corruption vulnerability where incorrect pointer dereferencing occurs when a DNS nameserver responds first to a query rather than waiting for the client. This memory corruption bug is considered potentially exploitable for remote code execution due to the nature of the pointer manipulation error.

MitigationUpgrade adns to version 1.5.2 or later to obtain the patched version that corrects the pointer dereference logic.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FedoraOperating system
Affected:= 31= 32
AdnsApplication
Affected:< 1.5.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify adns package is installed
    On Fedora: run 'rpm -qa | grep -i adns' or 'dnf list installed adns'. On other Linux: check for /usr/lib/libadns.so or run 'adnsd' process
    Affected if adns package or library is present on the system
  2. Determine installed adns version on Fedora
    Run 'rpm -q adns' or 'dnf list installed adns' to see the exact version number
    Affected if Version shown is below 1.5.2 (for example, 1.5.1 or earlier) or the package is present but version cannot be determined as 1.5.2+
  3. Check GNU adns library version
    Run 'adnsresfilter --version' or check 'ldd <binary-using-adns>' and then 'ls -l /usr/lib/libadns.so*' to find the library version
    Affected if Library version file shows a version number less than 1.5.2
  4. Verify if adns daemon or client tools are in use
    Run 'ps aux | grep adns' or check running services that depend on asynchronous DNS resolution
    Affected if adns-related processes are running and the installed version is below 1.5.2

The system is affected if adns (as a package, library, or running service) is installed with a version number less than 1.5.2, or if the version cannot be confirmed as 1.5.2 or later.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to 1.5.2 or later
Fixed in 1.5.2
Interim mitigation

Upgrade adns to version 1.5.2 or later to obtain the patched version that corrects the pointer dereference logic.

Fix this in Fedora Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA3.0 h
16.0 hours of engineering $2,760
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2017-9105 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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