Format string vulnerability in MemeCode Software i.Scribe 1.88 through 2.00 before Beta9 allows remote SMTP servers to cause a denial of service (crash) and possibly execute arbitrary code via format string specifiers in a server response, which is not properly handled when displaying the signon message.
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 |
|---|---|---|---|
| I.scribe | Memcode | 1.88 (including) | 1.88 (including) |
| I.scribe | Memcode | 1.89 (including) | 1.89 (including) |
| I.scribe | Memcode | 1.90 (including) | 1.90 (including) |
| I.scribe | Memcode | 2.00-alpha1 (including) | 2.00-alpha1 (including) |
| I.scribe | Memcode | 2.00-alpha2 (including) | 2.00-alpha2 (including) |
| I.scribe | Memcode | 2.00-alpha3 (including) | 2.00-alpha3 (including) |
| I.scribe | Memcode | 2.00-alpha4 (including) | 2.00-alpha4 (including) |
| I.scribe | Memcode | 2.00-beta10 (including) | 2.00-beta10 (including) |
| I.scribe | Memcode | 2.00-beta11 (including) | 2.00-beta11 (including) |
| I.scribe | Memcode | 2.00-beta6 (including) | 2.00-beta6 (including) |
| I.scribe | Memcode | 2.00-beta7 (including) | 2.00-beta7 (including) |
| I.scribe | Memcode | 2.00-beta8 (including) | 2.00-beta8 (including) |
| I.scribe | Memcode | 2.00-beta9 (including) | 2.00-beta9 (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.