cURL HSTS cleartext transmission

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in cURL. Affected by this vulnerability is an unknown functionality of the component HSTS Handler. This manipulation causes cleartext transmission. This vulnerability is registered as CVE-2022-43551. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in cURL (Network Utility Software) (the affected version is unknown) and classified as problematic. Affected by this vulnerability is an unknown code of the component HSTS Handler. The manipulation with an unknown input leads to a cleartext transmission vulnerability. The CWE definition for the vulnerability is CWE-319. The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors. As an impact it is known to affect confidentiality. The summary by CVE is:

A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. Like using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop (U+002E) `.`. Then in a subsequent request, it does not detect the HSTS state and makes a clear text transfer. Because it would store the info IDN encoded but look for it IDN decoded.

The weakness was published 12/22/2022. It is possible to read the advisory at access.redhat.com. This vulnerability is known as CVE-2022-43551. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1040 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 211153 (Fedora 37 : curl (2022-d7ee33d4ad)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (211153). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Cleartext transmission
CWE: CWE-319 / CWE-310
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: 211153
Nessus Name: Fedora 37 : curl (2022-d7ee33d4ad)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/20/2022 🔍
12/22/2022 +63 days 🔍
12/22/2022 +0 days 🔍
02/13/2026 +1149 days 🔍

Sourcesinfo

Advisory: FEDORA-2022-d7ee33d4ad
Status: Confirmed

CVE: CVE-2022-43551 (🔍)
GCVE (CVE): GCVE-0-2022-43551
GCVE (VulDB): GCVE-100-216535

Entryinfo

Created: 12/22/2022 21:16
Updated: 02/13/2026 22:00
Changes: 12/22/2022 21:16 (36), 01/22/2023 13:02 (3), 01/22/2023 13:10 (11), 11/15/2024 04:21 (17), 02/13/2026 22:00 (13)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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