Sysdig Free Space Calculation Mishandling Security Bypass Vulnerability [CVE-2019-8339]

CVE Number – CVE-2019-8339

A vulnerability in Sysdig as used with Falcon and other products could allow a local attacker to bypass security restrictions and execute arbitrary code on a targeted system.

The vulnerability is due to improper handling of a free space calculation by the record_event_consumer function, as defined in the driver/main.c source code file in the sysdig-probe.ko and falco-probe.ko files of the affected software. An attacker could exploit this vulnerability to bypass security restrictions. A successful exploit could allow the attacker to execute arbitrary code on a targeted system. 

Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available. 

Sysdig has confirmed the vulnerability and released software updates.

Analysis

• To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement could reduce the likelihood of a successful exploit.

Safeguards

• Administrators are advised to apply the appropriate updates.
  
  Administrators are advised to allow only trusted users to access local systems.
  
  Administrators are advised to allow only privileged users to access administration or management systems.
  
  Administrators are advised to monitor critical systems.

Vendor Announcements

• Sysdig has released a blog post at the following link: CVE-2019-8339, a Falco capacity related vulnerability

Fixed Software

• Sysdig has released software updates at the following link: Falco 0.15.0