CVE Vulnerability

CVE-2021-3882

LedgerSMB does not set the 'Secure' attribute on the session authorization cookie when the client uses HTTPS and the LedgerSMB server is behind a reverse proxy. By tricking a user to use an unencrypted connection (HTTP), an attacker may be able to obtain the authentication data by capturing network traffic. LedgerSMB 1.8 and newer switched from Basic authentication to using cookie authentication with encrypted cookies. Although an attacker can't access the information inside the cookie, nor the password of the user, possession of the cookie is enough to access the application as the user from which the cookie has been obtained. In order for the attacker to obtain the cookie, first of all the server must be configured to respond to unencrypted requests, the attacker must be suitably positioned to eavesdrop on the network traffic between the client and the server *and* the user must be tricked into using unencrypted HTTP traffic. Proper audit control and separation of duties limit Integrity impact of the attack vector. Users of LedgerSMB 1.8 are urged to upgrade to known-fixed versions. Users of LedgerSMB 1.7 or 1.9 are unaffected by this vulnerability and don't need to take action. As a workaround, users may configure their Apache or Nginx reverse proxy to add the Secure attribute at the network boundary instead of relying on LedgerSMB. For Apache, please refer to the 'Header always edit' configuration command in the mod_headers module. For Nginx, please refer to the 'proxy_cookie_flags' configuration command.

4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 4.9 / Impact : 4.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

Scope

6.8 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.6 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://huntr.dev/bounties/7061d97a-98a5-495a-8ba0-3a4c66091e9d Exploit Third Party Advisory
https://github.com/ledgersmb/ledgersmb/commit/c242f5a2abf4b99b0da205473cbba034f306bfe2 Patch Third Party Advisory
https://ledgersmb.org/cve-2021-3882-sensitive-non-secure-cookie Broken Link
Configurations

Configuration 1

cpe:2.3:a:ledgersmb:ledgersmb:1.8.0:-:*:*:*:*:*:*
Information

Published : 2021-10-14 09:15

Updated : 2022-10-27 01:04

NVD link : CVE-2021-3882

Mitre link : CVE-2021-3882

Products Affected
No products.
CWE
CWE-311

Missing Encryption of Sensitive Data