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CriticalPublic exploit

Command Injection in Fujitsu ETERNUS CentricStor CS8000 grel.php

IdentifiersCVE-2022-31795CWE-78· Improper Neutralization of Special…

CVE-2022-31795 is a command injection vulnerability in the grel_finfo function of grel.php on Fujitsu ETERNUS CentricStor CS8000 (Control Center) devices prior to 8.1A SP02 P04. The vulnerability arises from insufficient input validation on the user, pw, and file parameters, which are passed directly to system-level functions. This allows unauthenticated attackers to inject special characters and command substitution sequences, resulting in arbitrary command execution as the 'www-data' user.

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ANALYST BRIEF

Impact, mitigation & remediation

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Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows unauthenticated remote attackers to execute arbitrary commands as the 'www-data' user. Due to an outdated kernel, privilege escalation to root is trivial, granting full control over the appliance. Attackers can read, modify, or destroy virtual backup tapes, potentially facilitating ransomware attacks by destroying backup data. The vulnerability is accessible over the network and can be exploited without authentication.

Mitigation

If you can’t patch tonight, do this now.

Restrict network access to the appliance by blocking inbound traffic to ports 80 and 443. Limit access to the management LAN. As a temporary measure, bind the web interface to localhost and use SSH port forwarding for access. Note that applying this mitigation may void the product warranty.

Remediation

Patch, then assume compromise.

Upgrade to Fujitsu ETERNUS CentricStor CS8000 version 8.1A SP02 P04 or 8.0A SP01, which contain patches for this vulnerability. The update must be requested from Fujitsu due to their software distribution model. Ensure the appliance is running the latest available software version.
PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

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VendorProductType
FujitsuEternus Cs8000 Firmwareoperating_system

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Threat actor evidence

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Associated malware1

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Detection signatures

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Social activity

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