PT-2021-22577 · Unknown · Mylittlebackup

Omriinbar · Published 2021-09-15 · Updated 2021-10-07 · CVE-2021-39392

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions: MyLittleBackup versions up to and including 1.7

Description: The management tool in MyLittleBackup allows remote attackers to execute arbitrary code because the machineKey is hardcoded in web.config, and can be used to send serialized ASP code. This issue affects all customers' installations due to the use of the same hardcoded machineKey.

Recommendations: For MyLittleBackup versions up to and including 1.7, consider changing the hardcoded machineKey in web.config to a unique value for each installation as a temporary workaround. However, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2021-39392

Affected Products

Mylittlebackup

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-39392 · Security Note
• https://osv.dev/vulnerability/CVE-2021-39392 · Vendor Advisory
• https://gist.github.com/omriinbar/65827626e63f15e3e50557e2d9d61281 · Note
• https://t.me/cibsecurity/28926 · Telegram Post
• http://mylittlebackup.com/mlb/zip/mlb_1.7.zip · Note