Linus Torvalds wrote:
In particular, it's fairly easy to create a shared library that replaces a
system library (LD_LIBRARY_PATH) and then just dumps out the binary image.
What prevents you from injecting a shared library and manipulating a
suid executable? Does the environment get cleared when you exec a suid
program? Or does the dynamic linker just notice euid != uid and ignore
the LD environment variables? If so then would adding the sgid bit and
making the binary owned by a powerless group effectively prevent this
attack vector to read it?
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