![]() ![]() ![]() This overflows the officially-allocated buffer and overwrites data in the next block of memory along, even though that memory might already be in use by some other part of the program.īuffer overflows therefore typically produce similar side-effects to use-after-free bugs: mostly, the vulnerable program will crash sometimes, however, the program can be tricked into running untrusted code without warning. ![]() Sometimes, however, use-after-free bugs can be triggered deliberately in order to misdirect the software so that it misbehaves (for example by skipping a security check, or trusting the wrong block of input data) and provokes unauthorised behaviour.Ī heap buffer overflow means asking for a block of memory, but writing out more data than will fit safely into it. Often, bugs of this sort will cause the software to crash completely, by messing up calculations or memory access in an unrecoverable way. …only to carry on using that memory anyway, thus potentially causing one part of Chrome to rely on data it thought it could trust, without realising that another part of the software might still be tampering with that data.
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