Format string vulnerability in a logging function as used by various SFTP servers, including (1) AttachmateWRQ Reflection for Secure IT UNIX Server before 6.0.0.9, (2) Reflection for Secure IT Windows Server before 6.0 build 38, (3) F-Secure SSH Server for Windows before 5.3 build 35, (4) F-Secure SSH Server for UNIX 3.0 through 5.0.8, (5) SSH Tectia Server 4.3.6 and earlier and 4.4.0, and (6) SSH Shell Server 3.2.9 and earlier, allows remote authenticated users to execute arbitrary commands via unspecified vectors, involving crafted filenames and the stat command.
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Reflection_for_secure_it_server | Attachmatewrq | 6.0 (including) | 6.0 (including) |
| F-secure_ssh_server | F-secure | 3.0.0 (including) | 3.0.0 (including) |
| F-secure_ssh_server | F-secure | 3.0.1 (including) | 3.0.1 (including) |
| F-secure_ssh_server | F-secure | 3.0.2 (including) | 3.0.2 (including) |
| F-secure_ssh_server | F-secure | 3.0.3 (including) | 3.0.3 (including) |
| F-secure_ssh_server | F-secure | 3.0.4 (including) | 3.0.4 (including) |
| F-secure_ssh_server | F-secure | 3.0.5 (including) | 3.0.5 (including) |
| F-secure_ssh_server | F-secure | 3.0.6 (including) | 3.0.6 (including) |
| F-secure_ssh_server | F-secure | 3.0.7 (including) | 3.0.7 (including) |
| F-secure_ssh_server | F-secure | 3.0.8 (including) | 3.0.8 (including) |
| F-secure_ssh_server | F-secure | 3.0.9 (including) | 3.0.9 (including) |
| F-secure_ssh_server | F-secure | 3.1.0 (including) | 3.1.0 (including) |
| F-secure_ssh_server | F-secure | 3.1.0_build9 (including) | 3.1.0_build9 (including) |
| F-secure_ssh_server | F-secure | 3.2.0 (including) | 3.2.0 (including) |
| F-secure_ssh_server | F-secure | 3.2.3 (including) | 3.2.3 (including) |
| F-secure_ssh_server | F-secure | 5.0 (including) | 5.0 (including) |
| F-secure_ssh_server | F-secure | 5.1 (including) | 5.1 (including) |
| F-secure_ssh_server | F-secure | 5.2 (including) | 5.2 (including) |
| F-secure_ssh_server | F-secure | 5.3 (including) | 5.3 (including) |
When an attacker can modify an externally-controlled format string, this can lead to buffer overflows, denial of service, or data representation problems. It should be noted that in some circumstances, such as internationalization, the set of format strings is externally controlled by design. If the source of these format strings is trusted (e.g. only contained in library files that are only modifiable by the system administrator), then the external control might not itself pose a vulnerability.