Date: Mon, 14 Nov 2016 19:58:01 +0100 From: Sebastian Pipping <sebastian@...ping.org> To: oss-security@...ts.openwall.com Cc: Antonio Ceballos <aceballos@...il.com> Subject: Re: Re: CVE needed? / gnuchess 6.2.4 fixed user input buffer overflow Thanks for pointing to -u / UCI mode. I guess it does make sense to request/assign a CVE then. The initial report seems to be by Antti Karjalainen at http://lists.gnu.org/archive/html/bug-gnu-chess/2015-10/msg00002.html . Best, Sebastian On 14.11.2016 10:42, cve-assign@...re.org wrote: > The reference for this bug is: > > http://svn.savannah.gnu.org/viewvc?view=rev&root=chess&revision=134 > >> may need some other application in front (e.g. a website >> using gnuchess for a backend or some mobile/desktop application >> forwarding evil input to gnuchess with improper validation) to attack. > > Is it vulnerable without such an application if launched as > "gnuchess -u" (UCI mode)? For example, is it taking untrusted input of > 4096 characters and sending it to the ValidateMove function that is > expecting 128? > > > #define BUF_SIZE 4096 > > #define MAXSTR 128 > > > if ( flags & UCI ) > ... > NextEngineCmd(); > ... > ReadFromEngine(); > > > static char engineinputbuf[BUF_SIZE]=""; > > > nread = read( pipefd_a2f, engineinputaux, BUF_SIZE ); > strcat( engineinputbuf, engineinputaux ); > > > char enginemovestr[BUF_SIZE]=""; > enginemove = ValidateMove( enginemovestr ); > >
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