CVE-2021-3047 PAN-OS: Weak Cryptography Used in Web Interface Authentication
Description
A cryptographically weak pseudo-random number generator (PRNG) is used during authentication to the Palo Alto Networks PAN-OS web interface. This enables an authenticated attacker, with the capability to observe their own authentication secrets over a long duration on the PAN-OS appliance, to impersonate another authenticated web interface administrator's session.
This issue impacts:
PAN-OS 8.1 versions earlier than PAN-OS 8.1.19;
PAN-OS 9.0 versions earlier than PAN-OS 9.0.14;
PAN-OS 9.1 versions earlier than PAN-OS 9.1.10;
PAN-OS 10.0 versions earlier than PAN-OS 10.0.4.
PAN-OS 10.1 versions are not impacted.
Product Status
| Versions | Affected | Unaffected |
|---|---|---|
| PAN-OS 10.1 | None | 10.1.* |
| PAN-OS 10.0 | < 10.0.4 | >= 10.0.4 |
| PAN-OS 9.1 | < 9.1.10 | >= 9.1.10 |
| PAN-OS 9.0 | < 9.0.14 | >= 9.0.14 |
| PAN-OS 8.1 | < 8.1.19 | >= 8.1.19 |
Required Configuration for Exposure
There is no specific configuration required for this exposure—all web interface authentication methods are impacted by this issue.
Severity: MEDIUM
CVSSv3.1 Base Score: 4.2 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N)
Weakness Type
CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Solution
This issue is fixed in PAN-OS 8.1.19, PAN-OS 9.0.14, PAN-OS 9.1.10, PAN-OS 10.0.4, and all later PAN-OS versions.
Workarounds and Mitigations
There are no known workarounds for this issue.