Some vulnerabilities have been reported in OpenTTD, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise a vulnerable system.
1) Some format string error in the handling of network text messages in network_server.c, network.c, console_cmds.c, and network_client.c can be exploited to crash the OpenTTD server or client and potentially to execute arbitrary code.
2) Some boundary errors due to the unsafe use of "vsprintf()" may be exploited to cause a DoS and potentially to execute arbitrary code.
Vulnerabilities #1 and #2 have been reported in version 0.4.0.1. Other versions may also be affected.
3) An input validation error exists in the "CmdPlantTree()" function in tree_cmd.c when handling the tree-planting command. This may be exploited to cause a buffer overflow.
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Subject: OpenTTD Format String and Buffer Overflow Vulnerabilities
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