Description: Luigi Auriemma has reported some vulnerabilities in Doomsday, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise a vulnerable system.
1) A boundary error exists within the "D_NetPlayerEvent()" function in d_net.c when processing chat messages. This can be exploited to overflow a global buffer by sending an overly long chat message to the affected server.
Successful exploitation may allow the execution of arbitrary code on the game server and the connected clients.
2) A boundary error exists within the "Msg_Write()" function in net_msg.c when processing chat messages. This can be exploited to overflow a global buffer by sending an overly long chat message to the affected server.
3) An integer underflow error exists within the "Sv_HandlePacket()" in sv_main.c when processing chat messages. This can be exploited to trigger a failure to allocate required memory, which leads to a DoS.
4) A boundary error exists within the "NetSv_ReadCommands()" function in d_netsv.c when processing client commands. This can be exploited to overflow a static buffer by sending more than 30 commands to the affected server.
5) A format string error exists within the "Cl_GetPackets()" function when processing "PSV_CONSOLE_TEXT" messages sent by the server. This can potentially be exploited by a malicious server to execute arbitrary code on the affected clients by sending a specially crafted messages.
NOTE: An error in the processing of chat messages may leave a string without a NULL character at the end. This may trigger other vulnerabilities.
The vulnerabilities are reported in version 1.9.0-beta5.1 and prior. Other versions may also be affected.
Solution: Vulnerabilities #1 through #4 are reportedly fixed in version 1.9.0-beta5.2.
Host and play games on trusted networks only.
Use another product.
Provided and/or discovered by: Luigi Auriemma
Changelog: 2007-09-04: Added CVE reference.
2008-02-07: Updated "Solution".
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