The NTLMSSP authentication implementation in Samba 3.x and 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 allows man-in-the-middle attackers to perform protocol-downgrade attacks by modifying the client-server data stream to remove application-layer flags or encryption settings, as demonstrated by clearing the NTLMSSP_NEGOTIATE_SEAL or NTLMSSP_NEGOTIATE_SIGN option to disrupt LDAP security.
2016-04-25T00:59:01.113
2025-04-12T10:46:40.837
Deferred
CVSSv3.0: 5.9 (MEDIUM)
AV:N/AC:M/Au:N/C:N/I:P/A:N
8.6
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | samba | samba | 3.0.0 | Yes |
| Application | samba | samba | 3.0.1 | Yes |
| Application | samba | samba | 3.0.2 | Yes |
| Application | samba | samba | 3.0.2 | Yes |
| Application | samba | samba | 3.0.2a | Yes |
| Application | samba | samba | 3.0.3 | Yes |
| Application | samba | samba | 3.0.4 | Yes |
| Application | samba | samba | 3.0.4 | Yes |
| Application | samba | samba | 3.0.5 | Yes |
| Application | samba | samba | 3.0.6 | Yes |
| Application | samba | samba | 3.0.7 | Yes |
| Application | samba | samba | 3.0.8 | Yes |
| Application | samba | samba | 3.0.9 | Yes |
| Application | samba | samba | 3.0.10 | Yes |
| Application | samba | samba | 3.0.11 | Yes |
| Application | samba | samba | 3.0.12 | Yes |
| Application | samba | samba | 3.0.13 | Yes |
| Application | samba | samba | 3.0.14 | Yes |
| Application | samba | samba | 3.0.14 | Yes |
| Application | samba | samba | 3.0.14a | Yes |
| Application | samba | samba | 3.0.15 | Yes |
| Application | samba | samba | 3.0.16 | Yes |
| Application | samba | samba | 3.0.17 | Yes |
| Application | samba | samba | 3.0.18 | Yes |
| Application | samba | samba | 3.0.19 | Yes |
| Application | samba | samba | 3.0.20 | Yes |
| Application | samba | samba | 3.0.20 | Yes |
| Application | samba | samba | 3.0.20 | Yes |
| Application | samba | samba | 3.0.20a | Yes |
| Application | samba | samba | 3.0.20b | Yes |
| Application | samba | samba | 3.0.21 | Yes |
| Application | samba | samba | 3.0.21 | Yes |
| Application | samba | samba | 3.0.21 | Yes |
| Application | samba | samba | 3.0.21 | Yes |
| Application | samba | samba | 3.0.21a | Yes |
| Application | samba | samba | 3.0.21b | Yes |
| Application | samba | samba | 3.0.21c | Yes |
| Application | samba | samba | 3.0.22 | Yes |
| Application | samba | samba | 3.0.23 | Yes |
| Application | samba | samba | 3.0.23 | Yes |
| Application | samba | samba | 3.0.23 | Yes |
| Application | samba | samba | 3.0.23 | Yes |
| Application | samba | samba | 3.0.23 | Yes |
| Application | samba | samba | 3.0.23a | Yes |
| Application | samba | samba | 3.0.23b | Yes |
| Application | samba | samba | 3.0.23c | Yes |
| Application | samba | samba | 3.0.23d | Yes |
| Application | samba | samba | 3.0.24 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25 | Yes |
| Application | samba | samba | 3.0.25a | Yes |
| Application | samba | samba | 3.0.25b | Yes |
| Application | samba | samba | 3.0.25c | Yes |
| Application | samba | samba | 3.0.26 | Yes |
| Application | samba | samba | 3.0.26 | Yes |
| Application | samba | samba | 3.0.26a | Yes |
| Application | samba | samba | 3.0.27 | Yes |
| Application | samba | samba | 3.0.27 | Yes |
| Application | samba | samba | 3.0.28 | Yes |
| Application | samba | samba | 3.0.28 | Yes |
| Application | samba | samba | 3.0.29 | Yes |
| Application | samba | samba | 3.0.30 | Yes |
| Application | samba | samba | 3.0.31 | Yes |
| Application | samba | samba | 3.0.32 | Yes |
| Application | samba | samba | 3.0.33 | Yes |
| Application | samba | samba | 3.0.34 | Yes |
| Application | samba | samba | 3.0.35 | Yes |
| Application | samba | samba | 3.0.36 | Yes |
| Application | samba | samba | 3.0.37 | Yes |
| Application | samba | samba | 3.2.0 | Yes |
| Application | samba | samba | 3.2.1 | Yes |
| Application | samba | samba | 3.2.2 | Yes |
| Application | samba | samba | 3.2.3 | Yes |
| Application | samba | samba | 3.2.4 | Yes |
| Application | samba | samba | 3.2.5 | Yes |
| Application | samba | samba | 3.2.6 | Yes |
| Application | samba | samba | 3.2.7 | Yes |
| Application | samba | samba | 3.2.8 | Yes |
| Application | samba | samba | 3.2.9 | Yes |
| Application | samba | samba | 3.2.10 | Yes |
| Application | samba | samba | 3.2.11 | Yes |
| Application | samba | samba | 3.2.12 | Yes |
| Application | samba | samba | 3.2.13 | Yes |
| Application | samba | samba | 3.2.14 | Yes |
| Application | samba | samba | 3.2.15 | Yes |
| Application | samba | samba | 3.3.0 | Yes |
| Application | samba | samba | 3.3.1 | Yes |
| Application | samba | samba | 3.3.2 | Yes |
| Application | samba | samba | 3.3.3 | Yes |
| Application | samba | samba | 3.3.4 | Yes |
| Application | samba | samba | 3.3.5 | Yes |
| Application | samba | samba | 3.3.6 | Yes |
| Application | samba | samba | 3.3.7 | Yes |
| Application | samba | samba | 3.3.8 | Yes |
| Application | samba | samba | 3.3.9 | Yes |
| Application | samba | samba | 3.3.10 | Yes |
| Application | samba | samba | 3.3.11 | Yes |
| Application | samba | samba | 3.3.12 | Yes |
| Application | samba | samba | 3.3.13 | Yes |
| Application | samba | samba | 3.3.14 | Yes |
| Application | samba | samba | 3.3.15 | Yes |
| Application | samba | samba | 3.3.16 | Yes |
| Application | samba | samba | 3.4.0 | Yes |
| Application | samba | samba | 3.4.1 | Yes |
| Application | samba | samba | 3.4.2 | Yes |
| Application | samba | samba | 3.4.3 | Yes |
| Application | samba | samba | 3.4.4 | Yes |
| Application | samba | samba | 3.4.5 | Yes |
| Application | samba | samba | 3.4.6 | Yes |
| Application | samba | samba | 3.4.7 | Yes |
| Application | samba | samba | 3.4.8 | Yes |
| Application | samba | samba | 3.4.9 | Yes |
| Application | samba | samba | 3.4.10 | Yes |
| Application | samba | samba | 3.4.11 | Yes |
| Application | samba | samba | 3.4.12 | Yes |
| Application | samba | samba | 3.4.13 | Yes |
| Application | samba | samba | 3.4.14 | Yes |
| Application | samba | samba | 3.4.15 | Yes |
| Application | samba | samba | 3.4.16 | Yes |
| Application | samba | samba | 3.4.17 | Yes |
| Application | samba | samba | 3.5.0 | Yes |
| Application | samba | samba | 3.5.1 | Yes |
| Application | samba | samba | 3.5.2 | Yes |
| Application | samba | samba | 3.5.3 | Yes |
| Application | samba | samba | 3.5.4 | Yes |
| Application | samba | samba | 3.5.5 | Yes |
| Application | samba | samba | 3.5.6 | Yes |
| Application | samba | samba | 3.5.7 | Yes |
| Application | samba | samba | 3.5.8 | Yes |
| Application | samba | samba | 3.5.9 | Yes |
| Application | samba | samba | 3.5.10 | Yes |
| Application | samba | samba | 3.5.11 | Yes |
| Application | samba | samba | 3.5.12 | Yes |
| Application | samba | samba | 3.5.13 | Yes |
| Application | samba | samba | 3.5.14 | Yes |
| Application | samba | samba | 3.5.15 | Yes |
| Application | samba | samba | 3.5.16 | Yes |
| Application | samba | samba | 3.5.17 | Yes |
| Application | samba | samba | 3.5.18 | Yes |
| Application | samba | samba | 3.5.19 | Yes |
| Application | samba | samba | 3.5.20 | Yes |
| Application | samba | samba | 3.5.21 | Yes |
| Application | samba | samba | 3.5.22 | Yes |
| Application | samba | samba | 3.6.0 | Yes |
| Application | samba | samba | 3.6.1 | Yes |
| Application | samba | samba | 3.6.2 | Yes |
| Application | samba | samba | 3.6.3 | Yes |
| Application | samba | samba | 3.6.4 | Yes |
| Application | samba | samba | 3.6.5 | Yes |
| Application | samba | samba | 3.6.6 | Yes |
| Application | samba | samba | 3.6.7 | Yes |
| Application | samba | samba | 3.6.8 | Yes |
| Application | samba | samba | 3.6.9 | Yes |
| Application | samba | samba | 3.6.10 | Yes |
| Application | samba | samba | 3.6.11 | Yes |
| Application | samba | samba | 3.6.12 | Yes |
| Application | samba | samba | 3.6.13 | Yes |
| Application | samba | samba | 3.6.14 | Yes |
| Application | samba | samba | 3.6.15 | Yes |
| Application | samba | samba | 3.6.16 | Yes |
| Application | samba | samba | 3.6.17 | Yes |
| Application | samba | samba | 3.6.18 | Yes |
| Application | samba | samba | 3.6.19 | Yes |
| Application | samba | samba | 3.6.20 | Yes |
| Application | samba | samba | 3.6.21 | Yes |
| Application | samba | samba | 3.6.22 | Yes |
| Application | samba | samba | 3.6.23 | Yes |
| Application | samba | samba | 3.6.24 | Yes |
| Application | samba | samba | 3.6.25 | Yes |
| Application | samba | samba | 4.0.0 | Yes |
| Application | samba | samba | 4.0.1 | Yes |
| Application | samba | samba | 4.0.2 | Yes |
| Application | samba | samba | 4.0.3 | Yes |
| Application | samba | samba | 4.0.4 | Yes |
| Application | samba | samba | 4.0.5 | Yes |
| Application | samba | samba | 4.0.6 | Yes |
| Application | samba | samba | 4.0.7 | Yes |
| Application | samba | samba | 4.0.8 | Yes |
| Application | samba | samba | 4.0.9 | Yes |
| Application | samba | samba | 4.0.10 | Yes |
| Application | samba | samba | 4.0.11 | Yes |
| Application | samba | samba | 4.0.12 | Yes |
| Application | samba | samba | 4.0.13 | Yes |
| Application | samba | samba | 4.0.14 | Yes |
| Application | samba | samba | 4.0.15 | Yes |
| Application | samba | samba | 4.0.16 | Yes |
| Application | samba | samba | 4.0.17 | Yes |
| Application | samba | samba | 4.0.18 | Yes |
| Application | samba | samba | 4.0.19 | Yes |
| Application | samba | samba | 4.0.20 | Yes |
| Application | samba | samba | 4.0.21 | Yes |
| Application | samba | samba | 4.0.22 | Yes |
| Application | samba | samba | 4.0.23 | Yes |
| Application | samba | samba | 4.0.24 | Yes |
| Application | samba | samba | 4.0.25 | Yes |
| Application | samba | samba | 4.0.26 | Yes |
| Application | samba | samba | 4.1.0 | Yes |
| Application | samba | samba | 4.1.1 | Yes |
| Application | samba | samba | 4.1.2 | Yes |
| Application | samba | samba | 4.1.3 | Yes |
| Application | samba | samba | 4.1.4 | Yes |
| Application | samba | samba | 4.1.5 | Yes |
| Application | samba | samba | 4.1.6 | Yes |
| Application | samba | samba | 4.1.7 | Yes |
| Application | samba | samba | 4.1.8 | Yes |
| Application | samba | samba | 4.1.9 | Yes |
| Application | samba | samba | 4.1.10 | Yes |
| Application | samba | samba | 4.1.11 | Yes |
| Application | samba | samba | 4.1.12 | Yes |
| Application | samba | samba | 4.1.13 | Yes |
| Application | samba | samba | 4.1.14 | Yes |
| Application | samba | samba | 4.1.15 | Yes |
| Application | samba | samba | 4.1.16 | Yes |
| Application | samba | samba | 4.1.17 | Yes |
| Application | samba | samba | 4.1.18 | Yes |
| Application | samba | samba | 4.1.19 | Yes |
| Application | samba | samba | 4.1.20 | Yes |
| Application | samba | samba | 4.1.21 | Yes |
| Application | samba | samba | 4.1.22 | Yes |
| Application | samba | samba | 4.1.23 | Yes |
| Application | samba | samba | 4.2.0 | Yes |
| Application | samba | samba | 4.2.0 | Yes |
| Application | samba | samba | 4.2.0 | Yes |
| Application | samba | samba | 4.2.0 | Yes |
| Application | samba | samba | 4.2.1 | Yes |
| Application | samba | samba | 4.2.2 | Yes |
| Application | samba | samba | 4.2.3 | Yes |
| Application | samba | samba | 4.2.4 | Yes |
| Application | samba | samba | 4.2.5 | Yes |
| Application | samba | samba | 4.2.6 | Yes |
| Application | samba | samba | 4.2.7 | Yes |
| Application | samba | samba | 4.2.8 | Yes |
| Application | samba | samba | 4.2.9 | Yes |
| Application | samba | samba | 4.3.0 | Yes |
| Application | samba | samba | 4.3.1 | Yes |
| Application | samba | samba | 4.3.2 | Yes |
| Application | samba | samba | 4.3.3 | Yes |
| Application | samba | samba | 4.3.4 | Yes |
| Application | samba | samba | 4.3.5 | Yes |
| Application | samba | samba | 4.3.6 | Yes |
| Application | samba | samba | 4.4.0 | Yes |
| Operating System | canonical | ubuntu_linux | 14.04 | Yes |
| Operating System | canonical | ubuntu_linux | 15.10 | Yes |
| Operating System | canonical | ubuntu_linux | 16.04 | Yes |