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Add upper limit for file size transfers (CVSS score: 4.0)#129
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Luke1410 wants to merge 1 commit intofacebookarchive:masterfrom
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Add upper limit for file size transfers (CVSS score: 4.0)#129Luke1410 wants to merge 1 commit intofacebookarchive:masterfrom
Luke1410 wants to merge 1 commit intofacebookarchive:masterfrom
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…s (fixes part of #19)
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This is a backport of a security relevant fix for RakNet which was brought to our attention by a user - see SLikeSoft#19 for details. The issue has already been fixed in SLikeNet 0.1.1 (see https://www.slikenet.com/).
We provide this backport for people who prefer to stick with the RakNet project and also in order to easier share this fix with other RakNet forks.
CVSS Base score: 4.3
CVSS Temporal score: 4.0
CVSS Overall score: 4.0
CVSS v3 vector: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C
The security implications are medium in our opinion. The issue only applies in applications which utilize the FileListTransfer class (f.e. used via the Autopatcher). When limiting the usage to the core functionality of RakNet, the app cannot be exploited via the vulnerability. If the app/game requires prior authentication, only authenticated users can exploit the vulnerability.
The problem surfaces by RakNet allowing unbound memory allocations when retrieving large files (up to 4GiB). If the allocation doesn't fail, RakNet will consume the amount of memory for as long as the file transfer takes. This can be used for DoS attacks ultimately trying to deplete the system resources on the server.
This pull requests adds a new compile time config value which should be defined to a reasonable value (f.e. 10 MB) based on the largest files which the game/app will transmit.