ZeroShell 3.9.3 /cgi-bin/kerbynet StartSessionSubmit os command injection

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.0$0-$5k0.06

A vulnerability has been found in ZeroShell 3.9.3 and classified as critical. Affected by this vulnerability is some unknown processing of the file /cgi-bin/kerbynet. The manipulation of the argument StartSessionSubmit with an unknown input leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-78. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Zeroshell 3.9.3 contains a command injection vulnerability in the /cgi-bin/kerbynet StartSessionSubmit parameter that could allow an unauthenticated attacker to execute a system command by using shell metacharacters and the %0a character.

The weakness was released 11/30/2020. It is possible to read the advisory at blog.quake.so. This vulnerability is known as CVE-2020-29390 since 11/30/2020. The exploitation appears to be easy. Access to the local network is required for this attack to succeed. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/11/2020).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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

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

NVD Base Score: 9.8
NVD Vector: 🔒

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

NVD Base Score: 🔒

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-78
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
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Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

11/30/2020 Advisory disclosed
11/30/2020 +0 days CVE assigned
11/30/2020 +0 days VulDB entry created
12/11/2020 +11 days VulDB last update

Sourcesinfoedit

Advisory: blog.quake.so
Status: Not defined

CVE: CVE-2020-29390 (🔒)

Entryinfoedit

Created: 11/30/2020 08:45 PM
Updated: 12/11/2020 02:39 PM
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
Complete: 🔍

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