We would like to express our gratitude to Igor Sak-Sakovskiy for bringing this issue to our attention.ģ. In limiting the practical application of this attack. Such attack is only possible if the intruder has managed to spoof or otherwise control user's DNS records. This is done to prevent a malicious web page from executing existing files on a user's computer. It also implements additional checks within the web notifier. WinRAR uses https instead of http in the web notifier window, home page and themes links. We are thankful to Jacob Thompson - Mandiant Advantage Labs for reporting this issue.Ģ. We already prohibited extracting contents of such malformed archives in WinRAR 6.01. It is done to prevent possible attacks with inclusion of ZIP archive into the signature body. ZIP SFX module refuses to process SFX commands stored in archive comment if such comment is resided after beginning of Authenticode digital signature. The max possible length of str_R and str_S is 60 because and are both 30 bytes long.1. If ECC signature of license type is and (, which means in_data = license type, in_private = null), convert their value to hex string str_R, str_S. We name them RegData0, RegData1, RegData2, RegData3 respectively. Here I give a case:Īctually, when WinRAR verifies user's license file, it does not case UID at all. It is just a join of two parts of registration data. Here I give a case:Īlso just a text line. 2.2.1 HeaderĪctually, when WinRAR verifies user's license file, it does not care what content the header have. Rarreg.key consists of a header, user's name, license type, UID, registration data and checksum. If I use a 17-elements-long list represent a polynomial over, whose every element represents a polynomial over, function can be defined as the following Python code: The detail of function will be talked about later.Īs I said before, it converts a polynomial over to a integer. Function converts a polynomial over to a integer whose bit length would not larger than 15 * 17 = 255. The dot in refers to the elliptic curve point multiplication on over. Now we have PrivateKey, random number, hash, order and base point. In my code I use a uint64_t array to store it.Ģ.1.2 The Generation of Singnature and PublicKey Let be base point that will be used during signature.
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