Ruby up to 2.4.7/2.5.6/2.6.4 Regular Expression looping/backtracking DigestAuth improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Ruby up to 2.4.7/2.5.6/2.6.4. Affected by this issue is the function WEBrick::HTTPAuth::DigestAuth of the file looping/backtracking of the component Regular Expression Handler. The manipulation results in improper authentication. This vulnerability is known as CVE-2019-16201. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Ruby up to 2.4.7/2.5.6/2.6.4 (Programming Language Software). It has been classified as problematic. Affected is the function WEBrick::HTTPAuth::DigestAuth of the file looping/backtracking of the component Regular Expression Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on availability. CVE summarizes:

WEBrick::HTTPAuth::DigestAuth in Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 has a regular expression Denial of Service cause by looping/backtracking. A victim must expose a WEBrick server that uses DigestAuth to the Internet or a untrusted network.

The weakness was published 11/26/2019. This vulnerability is traded as CVE-2019-16201 since 09/10/2019. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

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 CERT Bund (WID-SEC-2023-1110). Similar entries are available at VDB-146404 and VDB-146398. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • Open Source Arch Linux
  • Open Source Ruby

Productinfo

Type

Name

Version

License

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/10/2019 🔍
11/26/2019 +77 days 🔍
11/27/2019 +1 days 🔍
05/09/2026 +2355 days 🔍

Sourcesinfo

Advisory: DLA 2027-1
Status: Not defined

CVE: CVE-2019-16201 (🔍)
GCVE (CVE): GCVE-0-2019-16201
GCVE (VulDB): GCVE-100-146400
CERT Bund: WID-SEC-2023-1110 - Ruby: Mehrere Schwachstellen

See also: 🔍

Entryinfo

Created: 11/27/2019 07:05
Updated: 05/09/2026 18:30
Changes: 11/27/2019 07:05 (37), 11/27/2019 07:10 (18), 02/28/2024 11:56 (4), 05/09/2026 18:30 (22)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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