Nlnet Labs Unbound/NSD PID File link following

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Nlnet Labs Unbound and NSD. It has been declared as critical. This affects an unknown function of the component PID File Handler. Such manipulation leads to link following. This vulnerability is listed as CVE-2020-28935. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Nlnet Labs Unbound and NSD (Domain Name Software) (version now known) and classified as critical. Affected by this issue is some unknown processing of the component PID File Handler. The manipulation with an unknown input leads to a link following vulnerability. Using CWE to declare the problem leads to CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. Impacted is integrity, and availability.

The weakness was presented 12/08/2020. The advisory is shared for download at nlnetlabs.nl. This vulnerability is handled as CVE-2020-28935. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 214466 (Debian dla-3371 : libunbound-dev - security update), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (214466). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.4
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Link following
CWE: CWE-59
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 214466
Nessus Name: Debian dla-3371 : libunbound-dev - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/18/2020 🔍
12/08/2020 +20 days 🔍
12/08/2020 +0 days 🔍
01/23/2025 +1507 days 🔍

Sourcesinfo

Advisory: nlnetlabs.nl
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-28935 (🔍)
GCVE (CVE): GCVE-0-2020-28935
GCVE (VulDB): GCVE-100-165668

Entryinfo

Created: 12/08/2020 06:31
Updated: 01/23/2025 05:04
Changes: 12/08/2020 06:31 (36), 12/13/2020 07:36 (3), 12/13/2020 07:42 (18), 01/23/2025 05:04 (16)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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