Canonical Ubuntu Point-to-Point Protocol Daemon Arbitrary File Read Information Disclosure Vulnerability
August 11th, 2020
Vulnerability Details
This vulnerability allows local attackers to read arbitrary files 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 handling of environment variables in pppd. The issue results from the lack of proper validation of user-supplied data, which can allow the read of arbitrary files. An attacker can leverage this vulnerability to disclose stored credentials, leading to further compromise.
Additional Details
https://ubuntu.com/security/notices/USN-4451-1
https://ubuntu.com/security/notices/USN-4451-2
Disclosure Timeline
- 2020-07-22 - Vulnerability reported to vendor
- 2020-08-11 - Coordinated public release of advisory
Credit
Thomas Chauchefoin (@swapgs) from Synacktiv (@Synacktiv)
