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Revue de presse francophone :
- Appaloosa AppDome nouent un partenariat pour accompagner les entreprises dans le déploiement et la protection des applications mobiles
- D-Link offre une avec un routeur VPN sans fil AC
- 19 mai Paris Petit-Déjeuner Coreye Développer son business à l'abri des cyberattaques
- POYNTING PRESENTE LA NOUVELLE ANTENNE OMNI-291, SPECIALE MILIEU MARITIME, CÔTIER ET MILIEU HUMIDE
- Flexera Software Les utilisateurs français de PC progressent dans l'application de correctifs logiciels, mais des défis de tailles subsistent
- Riverbed lance SD-WAN basé sur le cloud
- Fujitsu multi-récompensé VMware lui décerne plusieurs Partner Innovation Awards à l'occasion du Partner Leadership Summit
- Zscaler Private Access sécuriser l'accès à distance en supprimant les risques inhérents aux réseaux privés virtuels
- QNAP annonce la sortie de QTS 4.2.1
- Une enquête réalisée par la société de cyber sécurité F-Secure a décelé des milliers de vulnérabilités graves, potentiellement utilisables par des cyber criminels pour infiltrer l'infrastru
- Trouver le juste équilibre entre une infrastructure dédiée et cloud le dilemme de la distribution numérique
- 3 juin - Fleurance - Cybersécurité Territoires
- Cyber-assurances Seules 40 pourcents des entreprises françaises sont couvertes contre les violations de sécurité et les pertes de données
- Des étudiants de l'ESIEA inventent CheckMyHTTPS un logiciel qui vérifie que vos connexions WEB sécurisées ne sont pas interceptées
- Les produits OmniSwitch d'Alcatel-Lucent Enterprise ALE gagnent en sécurité pour lutter contre les cyber-attaques modernes

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- Mises à jour en perspective pour le système Vigik
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Revue de presse internationale :
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Revue Twitter
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Integrating fwknop with the 'American Fuzzy Lop' Fuzzer

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Integrating fwknop with the 'American Fuzzy Lop' Fuzzer

Par cipherdyne.org System and Network Security
Le [2014-11-25] à 06:14:52



Présentation : Over the past few months, the American Fuzzy Lop AFL fuzzer written by Michal Zalewski has become a tour de force in the security field. Many interesting bugs have been found, including a late breaking bug in the venerable cpio utility that Michal announced to the full-disclosure list. It is clear that AFL is succeeding perhaps where other fuzzers have either failed or not been applied, and this is an important development for anyone trying to maintain a secure code base. That is, the ease of use coupled with powerful fuzzing strategies offered by AFL mean that open source projects should integrate it directly into their testing systems. This has been done for the fwknop project with some basic scripting and one patch to the fwknop code base. The patch was necessary because according to AFL documentation, projects that leverage things like encryption and cryptographic signatures are not well suited to brute force fuzzing coverage, and fwknop definitely fits into this category. Crypto being a fuzzing barrier is not unique to AFL - other fuzzers have the same problem. So, similarly to the libpng-nocrc.patch included in the AFL sources, encryption, digests, and base64 encoding are bypassed when fwknop is compiled with --enable-afl-fuzzing on the configure command line. One doesn't need to apply the patch manually - it is built directly into fwknop as of the 2.6.4 release. This is in support of a major goal for the fwknop project which is comprehensive testing. If you maintain an open source project that involves crypto and does any sort of encoding decoding parsing gated by crypto operations, then you should patch your project so that it natively supports fuzzing with AFL through an optional compile time step. As an example, here is a portion of the patch to fwknop that disables base64 encoding by just copying data manually index b 8423 c 2 .. 5 b 51121 100644 int b 64 _decode const char in, unsigned char out unsigned char dst out v 0 for i 0 in i in i ' ' i unsigned int index in i - 43 - 68 , 6 80 , 7 b 64 _decode const char in, unsigned char out if i 3 dst v 6 - 2 i 3 dst ' 0 ' Fortunately, so far all fuzzing runs with AFL have turned up zero issues crashes or hangs with fwknop, but the testing continues. Within fwknop, a series of wrapper scripts are used to fuzz the following four areas with AFL. These areas represent the major places within fwknop where data is consumed either via a configuration file or from over the network in the form of an SPA packet 1. SPA packet encoding decoding spa-pkts.sh 2. Server access.conf parsing server-access.sh 3. Server fwknopd.conf parsing server-conf.sh 4. Client fwknoprc file parsing client-rc.sh Each wrapper script makes sure fwknop is compiled with AFL support, executes afl-fuzz with the corresponding test cases necessary for good coverage, archives previous fuzzing output data, and supports resuming of previously stopped fuzzing jobs. Here is an example where the SPA packet encoding decoding routines are fuzzed with AFL after fwknop is compiled with AFL support cd fwknop.git test afl . compile afl-compile.sh . fuzzing-wrappers spa-pkts.sh . fuzzing-wrappers helpers fwknopd-stdin-test.sh SPA_PKT 1716411011200157 root 1397329899 2.0.1 1 127.0.0.2,tcp 22 AAAAA LD_LIBRARY_PATH .. .. lib .libs .. .. server .libs fwknopd -c .. conf default_fwknopd.conf -a .. conf default_access.conf -A -f -t Warning REQUIRE_SOURCE_ADDRESS not enabled for access stanza source 'ANY' echo -n 1716411011200157 root 1397329899 2.0.1 1 127.0.0.2,tcp 22 AAAAA SPA Field Values Random Value 1716411011200157 Username root Timestamp 1397329899 FKO Version 2.0.1 Message Type 1 Access msg Message String 127.0.0.2,tcp 22 Nat Access Server Auth Client Timeout 0 Digest Type 3 SHA256 HMAC Type 0 None Encryption Type 1 Rijndael Encryption Mode 2 CBC Encoded Data 1716411011200157 root 1397329899 2.0.1 1 127.0.0.2,tcp 22 SPA Data Digest AAAAA HMAC Final SPA Data 200157 root 1397329899 2.0.1 1 127.0.0.2,tcp 22 AAAAA SPA packet decode Success exit 0 LD_LIBRARY_PATH .. .. lib .libs afl-fuzz -T fwknopd,SPA,encode decode,00ffe19 -t 1000 -i test-cases spa-pkts -o fuzzing-output spa-pkts.out .. .. server .libs fwknopd -c .. conf default_fwknopd.conf -a .. conf default_access.conf -A -f -t afl-fuzz 0.66b Nov 23 2014 22 29 48 by You have 1 CPU cores and 2 runnable tasks utilization 200pourcents . Checking core_pattern... Setting up output directories... Output directory exists but deemed OK to reuse. Deleting old session data... Output dir cleanup successful. Scanning 'test-cases spa-pkts'... Creating hard links for all input files... Validating target binary... Attempting dry run with 'id 000000,orig spa.start'... Spinning up the fork server... All right - fork server is up. And now AFL is up and running note the git --abbrev-commit tag integrated into the text banner to make clear which code is being fuzzed AFL SPA packets fuzzing If the fuzzing run is stopped by hitting Ctrl-C, it can always be resumed as follows . fuzzing-wrappers spa-pkts.sh resume Although major areas in fwknop where data is consumed are effectively fuzzed with AFL, there is always room for improvement. With the wrapper scripts in place, it is easy to add new support for fuzzing other functionality in fwknop. For example, the digest cache file used by fwknopd to track SHA-256 digests of previously seen SPA packets is a good candidate. Taking things to the next level, another powerful technique that would make an interesting side project would be to build a syntax-aware version of AFL that handles SPA packets and or configuration files natively. The AFL documentation hints at this type of modification, and states that this could be done by altering the fuzz_one routine in afl-fuzz.c. There is already a fuzzer written in python for the fwknop project that is syntax-aware of the SPA data format see spa_fuzzing.py , but the mutators within AFL are undoubtedly much better than in spa_fuzzing.py. Hence, modifying AFL directly would be an effective strategy. Please feel free to open an issue against fwknop in github if you have a suggestion for enhanced integration with AFL. Most importantly, if you find a bug please let me know. Happy fuzzing

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Les derniers articles du site "cipherdyne.org System and Network Security" :

- Single Packet Authorization and Third Party Devices
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