WinSCP up to 5.17.9 URL injection

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CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.05

A vulnerability classified as critical has been found in WinSCP up to 5.17.9 (Connectivity Software). This affects some unknown functionality of the component URL Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-74. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

WinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads session settings. (For example, this is exploitable in a default installation in which WinSCP is the handler for sftp:// URLs.)

The weakness was shared 01/28/2021. The advisory is shared at winscp.net. This vulnerability is uniquely identified as CVE-2021-3331 since 01/27/2021. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 5.17.10 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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CPE 2.3infoedit

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CVSSv3infoedit

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.7

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CVSSv2infoedit

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

NVD Base Score: 🔒

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-74
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
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Predictions: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: WinSCP 5.17.10
Patch: github.com

Timelineinfoedit

01/27/2021 CVE assigned
01/28/2021 +1 days Advisory disclosed
01/28/2021 +0 days VulDB entry created
02/21/2021 +24 days VulDB last update

Sourcesinfoedit

Advisory: winscp.net
Status: Confirmed

CVE: CVE-2021-3331 (🔒)

Entryinfoedit

Created: 01/28/2021 08:49 AM
Updated: 02/21/2021 07:57 AM
Changes: (18) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
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