tinysvcmdns up to 2018-01-16 mDNS Packet uncompress_nlabel input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in tinysvcmdns up to 2018-01-16. This issue affects the function uncompress_nlabel of the component mDNS Packet Handler. This manipulation causes input validation. This vulnerability is tracked as CVE-2019-9747. The attack is possible to be carried out remotely. No exploit exists. It is recommended that the affected component be replaced with an alternative.

Detailsinfo

A vulnerability classified as problematic was found in tinysvcmdns up to 2018-01-16. Affected by this vulnerability is the function uncompress_nlabel of the component mDNS Packet Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

In tinysvcmdns through 2018-01-16, a maliciously crafted mDNS (Multicast DNS) packet triggers an infinite loop while parsing an mDNS query. When mDNS compressed labels point to each other, the function uncompress_nlabel goes into an infinite loop trying to analyze the packet with an mDNS query. As a result, the mDNS server hangs after receiving the malicious mDNS packet. NOTE: the product's web site states "This project is un-maintained, and has been since 2013. ... There are known vulnerabilities ... You are advised to NOT use this library for any new projects / products."

The bug was discovered 12/27/2018. The weakness was disclosed 03/13/2019. This vulnerability is known as CVE-2019-9747 since 03/13/2019. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 76 days. During that time the estimated underground price was around $0-$5k.

The problem might be mitigated by replacing the product with as an alternative.

The entry VDB-131708 is pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
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: Input validation
CWE: CWE-20
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Alternative
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/27/2018 🔍
03/13/2019 +76 days 🔍
03/13/2019 +0 days 🔍
03/14/2019 +1 days 🔍
08/01/2023 +1601 days 🔍

Sourcesinfo

Advisory: 11
Status: Not defined

CVE: CVE-2019-9747 (🔍)
GCVE (CVE): GCVE-0-2019-9747
GCVE (VulDB): GCVE-100-131707
See also: 🔍

Entryinfo

Created: 03/14/2019 07:24
Updated: 08/01/2023 09:59
Changes: 03/14/2019 07:24 (55), 05/16/2020 14:26 (1), 08/01/2023 09:59 (4)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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