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authorDaniel Stenberg <daniel@haxx.se>2013-05-19 23:24:29 +0200
committerDaniel Stenberg <daniel@haxx.se>2013-06-22 11:21:35 +0200
commit192c4f788d48f82c03e9cef40013f34370e90737 (patch)
tree3065f5fa6d538ed1aa21c2a7cc020c63ebd75086 /README
parentda0db499fd1fed3ab061d8c03d25c06164c9f429 (diff)
Curl_urldecode: no peeking beyond end of input buffer
Security problem: CVE-2013-2174 If a program would give a string like "%FF" to curl_easy_unescape() but ask for it to decode only the first byte, it would still parse and decode the full hex sequence. The function then not only read beyond the allowed buffer but it would also deduct the *unsigned* counter variable for how many more bytes there's left to read in the buffer by two, making the counter wrap. Continuing this, the function would go on reading beyond the buffer and soon writing beyond the allocated target buffer... Bug: http://curl.haxx.se/docs/adv_20130622.html Reported-by: Timo Sirainen
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