Advisory Details

August 11th, 2020

Canonical Ubuntu apport Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

ZDI-20-979
ZDI-CAN-11234

CVE ID CVE-2020-15702
CVSS SCORE 7.0, (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Canonical
AFFECTED PRODUCTS Ubuntu
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Canonical Ubuntu. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the apport package. The issue results from the lack of proper locking when performing operations on a file. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of root.

ADDITIONAL DETAILS Canonical has issued an update to correct this vulnerability. More details can be found at:
https://ubuntu.com/security/notices/USN-4449-1
DISCLOSURE TIMELINE
  • 2020-07-01 - Vulnerability reported to vendor
  • 2020-08-11 - Coordinated public release of advisory
CREDIT Ryota Shiga(@Ga_ryo_) of Flatt Security
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