Source |
Reversemode |
Identifiant |
8654601 |
Date de publication |
2023-03-31 20:35:32 (vue: 2025-03-07 20:12:10) |
Titre |
Méfiez-vous de la chaîne de java \\. Beware of Java\\'s String.getBytes |
Texte |
Parfois, il y a des bogues subtils dont l'origine peut être trouvée dans certaines bizarreries du langage sous-jacent utilisé pour construire le logiciel. Ce billet de blog décrit l'un de ces cas afin de permettre aux collègues chercheurs et développeurs de sécurité, qui ne le connaissent pas, prennent conscience de ce modèle vulnérable potentiel. En fait, je suis presque sûr que des bogues similaires à celui décrit ici affectent probablement un tas de produits / bases de code. dans Précédent Posts , i \\ 'a déjà décrit certains bogues dans le système électronique Swiss post \\ de Swiss. Tout en lisant leur Crypto-Primitifs Spécification , qui, parmi les autres choses, décrit l'algorithme de plan de perfectionnement Swiss Swiss,,, parmi d'autres choses remarqué quelque chose de potentiellement intéressant. Fondamentalement, il existe 4 types différents qui sont pris en charge: des tableaux d'octets, des chaînes, des entiers et des vecteurs. Avant d'être haché, les chaînes sont converties en un tableau d'octets via l'algorithme \\ ' stringToByTearray \' Cependant, en comparant \\ ' stringToByTearray \' et \\ ' bytearraytostring \', nous pouvons trouver une différence significative: les séquences UTF-8 invalides sont considérées que dans le second. Soit \\ voir comment cela a été mis en œuvre dans le code: Fichier: crypto-primitive-master / src / main / java / ch / post / it / evoting / cryptoprimitive / interne / utils / conversioninternal.java |
Notes |
★★★
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Envoyé |
Oui |
Condensat |
#ywh impactthis directly this +U0051+U0075+U0065+U0073+U0074+U0069+U006F+U006E+U005F+U0031+UD8AF +ud8af /** //this 04x 080: 081: 082: 083: 084: 085: 086: 087: 088: 089: 090: 091: 092: 093: 094: 095: 096: 097: 098: 099: 0other 0xbd 0xbf 0xef 0xfffd 100 100: 101: 102: 103: 104: 122 63d ;if =>> =arrays @code @link @linkplain @param @return @since Bathing Data1 Dumpinfo Encoding: String Stringtobytarray Swimship1 System Utf able about abuse according addition affect after algorithm already also always among any are args array arrays arrays; ars attack attacker aware badstring badstring+ badstring1 badstring2; badstring; base basically bathing1+ become been before behavior being best beware blog both bug bugs build buildcustomstring building bunch bypass byte bytearraytostring bytebuffer bytebuffer; bytes can case cases catch certain chance char character charactercodingexception charactercodingexception; charbuffer charbuffer; charset charsetdecoder charsetencoder charsetencoder; checkargument checked checknotnull checks class clause clearly code code:file: coder codingerroraction codingerroraction; collect collectors collectors; collision comparing comparisons comply confirmed considered contains control controlled conversions#bytearraytostring conversions#stringtobytearray converted correspond corresponds crypto cryptographic cryptoprimitives custom dat decode decoder default depending described describes description deserializing detect developers didn difference: different differs does doesn dumpinfo elaborates encode encoded encoder encodes encoding end equal equals error evoting exception expected fact fellow file: filter final find first follows followsswiss format found from future generated get getbytes given hand happen has hash hash3 hashed hashing have hear herein how however i=0;iars i=0;ihash3 identified illegal illegalargumentexception implementation:file: implemented implements import important inf inf+ injectively input instance int integer integers interesting internally invalid invoked isempty issues its jackson java java/** java/lang/string java079: joining json jsonnode know language languages latter latter contains leading length length;i++ let levelthe likely line logic long love main makes malformed map mapped master/src/main/java/ch/post/it/evoting/cryptoprimitives/internal/utils/conversionsinternal may method might more must nencoding new newdecoder newencoder nio not noticed null null; nullpointerexception numberformatexception objectmapper one only onmalformedinput onunmappablecharacter operates order origin original other out output over parseint parsing patched pattern pgm232 plays plus poc positive post posts potential potentially practice pretty previous primitives print printhex println printstacktrace probably process product products/codebases productsthe provider pseudo public publicstatic question quirks reading readtree readvalue reason recommendations recursivehash related replace replaced replacement replaces replacing required researchers result resultant resulting return return; returning role same scenarios security see seem seen sequence sequences short should significant silly similar software some something sometimes specials specific specification split standardcharsets standardcharsets; statement states static storing stream strictly string stringbadstring1 strings stringtobytearray stumble substituted subtle such sun supported: sure swiss system their crypto things think those throw throws thus tochararray tostring tries trigger try turn two types ud84f ud8af underlying unicode unmappable upon urls used uses using utf utf8 util utils valid value vectors version void voting voting in vulnerability vulnerable what when where which who whose will would wrap |
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