CVE-2021-3882 Detail

Current Description

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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  6.8 MEDIUM
Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Nist CVSS score does not match with CNA score
CNA:  huntr.dev
Base Score:  5.9 MEDIUM
Vector:  CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID CWE Name Source
CWE-311 Missing Encryption of Sensitive Data cwe source acceptance level NIST  
CWE-614 Sensitive Cookie in HTTPS Session Without 'Secure' Attribute Reference acceptance level huntr.dev  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3882
NVD Published Date:
10/14/2021
NVD Last Modified:
10/20/2021
Source:
huntr.dev