Unbound up to 1.10.0 Network Message Volume recursion

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Unbound up to 1.10.0. This impacts an unknown function of the component Network Message Volume Handler. Executing a manipulation can lead to recursion. This vulnerability appears as CVE-2020-12662. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Unbound up to 1.10.0. It has been declared as critical. This vulnerability affects an unknown function of the component Network Message Volume Handler. The manipulation with an unknown input leads to a recursion vulnerability. The CWE definition for the vulnerability is CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. As an impact it is known to affect availability. CVE summarizes:

Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.

The weakness was presented 05/19/2020 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2020-12662 since 05/05/2020. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 236759 (Alibaba Cloud Linux 3 : 0102: unbound (ALINUX3-SA-2022:0102)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.10.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236759). See VDB-155429 for similar entry. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Recursion
CWE: CWE-674 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 236759
Nessus Name: Alibaba Cloud Linux 3 : 0102: unbound (ALINUX3-SA-2022:0102)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Unbound 1.10.1

Timelineinfo

05/05/2020 🔍
05/19/2020 +14 days 🔍
05/20/2020 +1 days 🔍
05/15/2025 +1821 days 🔍

Sourcesinfo

Advisory: openwall.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2020-12662 (🔍)
GCVE (CVE): GCVE-0-2020-12662
GCVE (VulDB): GCVE-100-155428
See also: 🔍

Entryinfo

Created: 05/20/2020 06:21
Updated: 05/15/2025 17:14
Changes: 05/20/2020 06:21 (40), 05/20/2020 06:26 (17), 05/15/2025 17:14 (20)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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