cURL/libcURL up to 7.76.1 Command Line Option CURLOPT_TELNETOPTIONS information disclosure

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CVSS Meta Temp Score
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A vulnerability, which was classified as problematic, has been found in cURL and libcURL up to 7.76.1 (Network Utility Software). Affected by this issue is some unknown functionality of the component Command Line Option Handler. The manipulation of the argument CURLOPT_TELNETOPTIONS with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. Impacted is confidentiality. CVE summarizes:

curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.

The weakness was released 06/12/2021. The advisory is available at curl.se. This vulnerability is handled as CVE-2021-22898 since 01/06/2021. The exploitation is known to be easy. The attack may be launched remotely. A simple authentication is required for exploitation. Technical details are known, but there is no available exploit.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

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CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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

Exploitinginfoedit

Class: Information disclosure
CWE: CWE-200
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: github.com

Timelineinfoedit

01/06/2021 CVE assigned
06/12/2021 +156 days Advisory disclosed
06/12/2021 +0 days VulDB entry created
06/14/2021 +2 days VulDB last update

Sourcesinfoedit

Advisory: curl.se
Status: Confirmed

CVE: CVE-2021-22898 (🔒)

Entryinfoedit

Created: 06/12/2021 07:08 AM
Updated: 06/14/2021 08:35 AM
Changes: (5) vulnerability_cvss2_vuldb_tempscore vulnerability_cvss3_meta_tempscore vulnerability_cvss3_vuldb_tempscore source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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