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authorAlan Coopersmith <alan.coopersmith@oracle.com>2014-04-25 23:01:48 -0700
committerAlan Coopersmith <alan.coopersmith@oracle.com>2014-05-12 23:31:23 -0700
commit05c8020a49416dd8b7510cbba45ce4f3fc81a7dc (patch)
treef1b299a30243a21abaa847d375d1340322977870 /README
parent2f5e57317339c526e6eaee1010b0e2ab8089c42e (diff)
CVE-2014-0209: integer overflow of realloc() size in lexAlias()
lexAlias() reads from a file in a loop. It does this by starting with a 64 byte buffer. If that size limit is hit, it does a realloc of the buffer size << 1, basically doubling the needed length every time the length limit is hit. Eventually, this will shift out to 0 (for a length of ~4gig), and that length will be passed on to realloc(). A length of 0 (with a valid pointer) causes realloc to free the buffer on most POSIX platforms, but the caller will still have a pointer to it, leading to use after free issues. Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com> Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Reviewed-by: Matthieu Herrb <matthieu@herrb.eu>
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