Plattform
fortinet
Komponente
forticlientlinux-vcm-engine
Behoben in
6.4.1
6.2.8
6.2.5
6.0.9
6.0.7
CVE-2020-15934 describes a privilege escalation vulnerability within the VCM engine of FortiClient for Linux. This flaw allows a local attacker to elevate their privileges to root by exploiting the engine's handling of scripts. The vulnerability impacts versions 6.0.0 through 6.4.0 of FortiClientLinux, and a patch is available in version 6.4.1.
Successful exploitation of CVE-2020-15934 grants an attacker root access to the affected system. This allows them to execute arbitrary commands, install malware, modify system configurations, and potentially compromise sensitive data. The attack vector requires local access to the machine, meaning an attacker must already have some foothold on the system. The blast radius is limited to the individual machine, but the impact of root access is severe, enabling complete control over the compromised host. This vulnerability shares similarities with other privilege escalation exploits that leverage flawed script execution handling.
CVE-2020-15934 was published on December 19, 2024. There is no indication of active exploitation campaigns or KEV listing at the time of writing. Public proof-of-concept exploits are not widely available, suggesting a relatively low probability of immediate widespread exploitation, but the ease of exploitation once a PoC is available warrants attention.
Organizations deploying FortiClient for Linux in environments where local user access is permitted are at risk. This includes environments with shared user accounts, legacy systems with weak access controls, and those where users have elevated privileges beyond what is strictly necessary for their roles.
• linux / server:
journalctl -u forticlient | grep -i "vcm engine"• linux / server:
ps aux | grep -i "vcm engine"• linux / server:
find /opt/fortinet/forticlient/ -type f -name "*.sh"disclosure
Exploit-Status
EPSS
0.07% (20% Perzentil)
CISA SSVC
CVSS-Vektor
The primary mitigation for CVE-2020-15934 is to upgrade FortiClientLinux to version 6.4.1 or later, which contains the fix. If immediate upgrading is not possible, consider restricting script execution permissions within the VCM engine. While a direct WAF rule is unlikely to be effective, monitoring for unusual process creation events related to the VCM engine can provide early detection. After upgrading, confirm the fix by attempting to execute a malicious script within the VCM engine and verifying that it fails to escalate privileges.
Actualice FortiClient para Linux a una versión posterior a 6.4.0. Si no es posible actualizar, considere deshabilitar el motor VCM hasta que se pueda realizar la actualización. Consulte el advisory de Fortinet para obtener más detalles e instrucciones específicas.
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CVE-2020-15934 is a privilege escalation vulnerability in FortiClientLinux VCM engine versions 6.0.0–6.4.0, allowing local attackers to gain root access.
You are affected if you are running FortiClientLinux VCM engine versions 6.0.0 through 6.4.0. Upgrade to 6.4.1 or later to mitigate the risk.
Upgrade FortiClientLinux to version 6.4.1 or later. Consider restricting script execution permissions as a temporary workaround.
There is currently no evidence of active exploitation, but the vulnerability's ease of exploitation warrants vigilance.
Refer to the Fortinet security advisory for detailed information and updates: [https://www.fortinet.com/security/advisories/vcm-engine-privilege-escalation]
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