SB2019120501 - Multiple vulnerabilities in Palo Alto Networks PAN-OS

Description

This security bulletin contains information about 2 vulnerabilities.

1) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2019-1559)

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to decrypt sensitive information.

The vulnerability exists due to the way an application behaves, when it receives a 0-byte record with invalid padding compared to the record with an invalid MAC, which results in padding oracle. A remote attacker can decrypt data.

Successful exploitation of the vulnerability requires that the application is using "non-stitched" ciphersuites and calls SSL_shutdown() twice (first, via a BAD_RECORD_MAC and again via a CLOSE_NOTIFY). 

2) Improper Authentication (CVE-ID: CVE-2019-17437)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an error in authentication process. A local non-privileged user can gain elevated privileges on the device.

Remediation

Install update from vendor's website.

References

• https://securityadvisories.paloaltonetworks.com/Home/Detail/202
• https://securityadvisories.paloaltonetworks.com/Home/Detail/201