CVE-2022-31474

BackupBuddy 8.5.8.0 - 8.7.4.1 - Arbitrary File Download

2022-09-06 00:00

Strategic Overview

Status: Patched in 8.7.5
Affected Plugin: BackupBuddy
Affected Version: 8.5.8.0 – 8.7.4.1
CVSS: 7.5High
Weakness type: CWE-73 · External Control of File Name or Path
CVE: CVE-2022-31474

At a glance

CVE-2022-31474 is a high-severity External Control of File Name or Path vulnerability in the BackupBuddy WordPress plugin, affecting versions 8.5.8.0 – 8.7.4.1. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires no authentication. The issue is fixed in version 8.7.5; sites on affected versions should update now. Disclosed September 2022.

Vulnerability Overview

The BackupBuddy plugin for WordPress is vulnerable to unauthenticated arbitrary file downloads via the 'local-download' found in the backupbuddy_local_download() function in versions 8.5.8.0 to 8.7.4.1. This is due to a missing capability check and nonce check on the affected function that is called via an admin_init hook along with insufficient file path validation on the supplied download file. This makes is possible for unauthenticated attackers to supply the complete path to a file, or use directory traversal techniques, to read any file hosted on the server. This includes sensitive files such as /etc/passwd and /wp-config.php.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality.

CWE-73: External Control of File Name or Path

The product allows user input to control or influence paths or file names that are used in filesystem operations.

Remediation

Update to version 8.7.5, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to BackupBuddy: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: BackupBuddy 8.7.5 closes this, and updating the plugin is the step that ends it.

Firewall
Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2022-31474 https://www.wordfence.com/threat-intel/vulnerabilities/id/91221712-8f66-4c6f-94fb-75c34a7f1fa8 https://nvd.nist.gov/vuln/detail/CVE-2022-31474

Related records

Other vulnerabilities in BackupBuddy

CVSS Vector

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone

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