Contribuez à SecuObs en envoyant des bitcoins ou des dogecoins.
Nouveaux articles (fr): 1pwnthhW21zdnQ5WucjmnF3pk9puT5fDF
Amélioration du site: 1hckU85orcGCm8A9hk67391LCy4ECGJca

Contribute to SecuObs by sending bitcoins or dogecoins.

Chercher :
Newsletter :  


Revues :
- Presse
- Presse FR
- Vidéos
- Twitter
- Secuobs





Sommaires :
- Tendances
- Failles
- Virus
- Concours
- Reportages
- Acteurs
- Outils
- Breves
- Infrastructures
- Livres
- Tutoriels
- Interviews
- Podcasts
- Communiques
- USBsploit
- Commentaires


Revue Presse:
- Tous
- Francophone
- Par mot clé
- Par site
- Le tagwall


Top bi-hebdo:
- Ensemble
- Articles
- Revue
- Videos
- Twitter
- Auteurs


Articles :
- Par mot clé
- Par auteur
- Par organisme
- Le tagwall


Videos :
- Toutes
- Par mot clé
- Par site
- Le tagwall


Twitter :
- Tous
- Par mot clé
- Par compte
- Le tagwall


Commentaires :
- Breves
- Virus
- Failles
- Outils
- Tutoriels
- Tendances
- Acteurs
- Reportages
- Infrastructures
- Interviews
- Concours
- Livres
- Communiques


RSS/XML :
- Articles
- Commentaires
- Revue
- Revue FR
- Videos
- Twitter


RSS SecuObs :
- sécurité
- exploit
- windows
- attaque
- outil
- microsoft


RSS Revue :
- security
- microsoft
- windows
- hacker
- attack
- network


RSS Videos :
- curit
- security
- biomet
- metasploit
- biometric
- cking


RSS Twitter :
- security
- linux
- botnet
- attack
- metasploit
- cisco


RSS Comments :
- Breves
- Virus
- Failles
- Outils
- Tutoriels
- Tendances
- Acteurs
- Reportages
- Infrastructures
- Interviews
- Concours
- Livres
- Communiques


RSS OPML :
- Français
- International











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

Dernier articles de SecuObs :
- DIP, solution de partage d'informations automatisée
- Sqreen, protection applicative intelligente de nouvelle génération
- Renaud Bidou (Deny All): "L'innovation dans le domaine des WAFs s'oriente vers plus de bon sens et d'intelligence, plus de flexibilité et plus d'ergonomie"
- Mises à jour en perspective pour le système Vigik
- Les russes ont-ils pwn le système AEGIS ?
- Le ministère de l'intérieur censure une conférence au Canada
- Saut d'air gap, audit de firmware et (in)sécurité mobile au programme de Cansecwest 2014
- GCHQ: Le JTRIG torpille Anonymous qui torpille le JTRIG (ou pas)
- #FIC2014: Entrée en territoire inconnu
- Le Sénat investit dans les monnaies virtuelles

Revue de presse internationale :
- VEHICLE CYBERSECURITY DOT and Industry Have Efforts Under Way, but DOT Needs to Define Its Role in Responding to a Real-world Attack
- Demand letter served on poll body over disastrous Comeleak breach
- The Minimin Aims To Be The Simplest Theremin
- Hacking group PLATINUM used Windows own patching system against it
- Hacker With Victims in 100 Nations Gets 7 Years in Prison
- HPR2018 How to make Komboucha Tea
- Circuit Bender Artist bends Fresnel Lens for Art
- FBI Director Suggests iPhone Hacking Method May Remain Secret
- 2016 Hack Miami Conference May 13-15, 2016
- 8-bit Video Wall Made From 160 Gaming Keyboards
- In An Era Of Decline, News Sites Can t Afford Poor Web Performance
- BeautifulPeople.com experiences data breach 1m affected
- Swedish Air Space Infringed, Aircraft Not Required
- Why cybercriminals attack healthcare more than any other industry
- Setting the Benchmark in the Network Security Forensics Industry

Annuaire des videos
- FUZZING ON LINE PART THREE
- Official Maltego tutorial 5 Writing your own transforms
- Official Maltego tutorial 6 Integrating with SQL DBs
- Official Maltego tutorial 3 Importing CSVs spreadsheets
- install zeus botnet
- Eloy Magalhaes
- Official Maltego tutorial 1 Google s websites
- Official Maltego tutorial 4 Social Networks
- Blind String SQL Injection
- backdoor linux root from r57 php shell VPS khg crew redc00de
- How To Attaque Pc With Back Track 5 In Arabique
- RSA Todd Schomburg talks about Roundup Ready lines available in 2013
- Nessus Diagnostics Troubleshooting
- Panda Security Vidcast Panda GateDefender Performa Parte 2 de 2
- MultiPyInjector Shellcode Injection

Revue Twitter
- RT @fpalumbo: Cisco consistently leading the way ? buys vCider to boost its distributed cloud vision #CiscoONE
- @mckeay Looks odd... not much to go on (prob some slideshow/vid app under Linux)
- [SuggestedReading] Using the HTML5 Fullscreen API for Phishing Attacks
- RT @BrianHonan: Our problems are not technical but cultural. OWASP top 10 has not changed over the years @joshcorman #RSAC
- RT @mikko: Wow. Apple kernels actually have a function called PE_i_can_has_debugger:
- [Blog Spam] Metasploit and PowerShell payloads
- PinkiePie Strikes Again, Compromises Google Chrome in Pwnium Contest at Hack in the Box: For the second time thi...
- @mikko @fslabs y'all wldn't happen to have lat/long data sets for other botnets, wld you? Doing some research (free/open info rls when done)
- RT @nickhacks: Want to crash a remote host running Snow Leopard? Just use: nmap -P0 -6 --script=targets-ipv6-multicast-mld #wishiwaskidding
- An inexpensive proxy service called is actually a front for #malware distribution -

Mini-Tagwall
Revue de presse : security, microsoft, windows, hacker, attack, network, vulnerability, google, exploit, malware, internet, remote, iphone

+ de mots clés pour la revue de presse

Annuaires des videos : curit, security, biomet, metasploit, biometric, cking, password, windows, botnet, defcon, tutorial, crypt, xploit

+ de mots clés pour les videos

Revue Twitter : security, linux, botnet, attack, metasploit, cisco, defcon, phish, exploit, google, inject, server, firewall

+ de mots clés pour la revue Twitter

Top bi-hebdo des articles de SecuObs
- [Ettercap – Partie 2] Ettercap par l'exemple - Man In the Middle et SSL sniffing
- [Infratech - release] version 0.6 de Bluetooth Stack Smasher
- [IDS Snort Windows – Partie 2] Installation et configuration
- [Infratech - vulnérabilité] Nouvelle version 0.8 de Bluetooth Stack Smasher
- Mises à jour en perspective pour le système Vigik
- USBDumper 2 nouvelle version nouvelles fonctions !
- EFIPW récupère automatiquement le mot de passe BIOS EFI des Macbook Pro avec processeurs Intel
- La sécurité des clés USB mise à mal par USBDUMPER
- Une faille critique de Firefox expose les utilisateurs de Tor Browser Bundle
- Installation sécurisée d'Apache Openssl, Php4, Mysql, Mod_ssl, Mod_rewrite, Mod_perl , Mod_security

Top bi-hebdo de la revue de presse
- StackScrambler and the Tale of a Packet Parsing Bug

Top bi-hebdo de l'annuaire des videos
- DC++ Botnet. How To DDos A Hub With Fake IPs.
- Comment creer un server botnet!!!!(Réseau de pc zombies)
- Defcon 14 Hard Drive Recovery Part 3

Top bi-hebdo de la revue Twitter
- RT @secureideas: I believe that all the XSS flaws announced are fixed in CVS. Will test again tomorrow if so, release 1.4.3. #BASESnort
- Currently, we do not support 100% of the advanced PDF features found in Adobe Reader... At least that's a good idea.
- VPN (google): German Foreign Office Selects Orange Business for Terrestrial Wide: Full
- @DisK0nn3cT Not really, mostly permission issues/info leak...they've had a couple of XSS vulns but nothing direct.
- Swatting phreaker swatted and heading to jail: A 19-year-old American has been sentenced to eleven years in pris..
- RT @fjserna You are not a true hacker if the calc.exe payload is not the scientific one... infosuck.org/0x0035.png

Top des articles les plus commentés
- [Metasploit 2.x – Partie 1] Introduction et présentation
- Microsoft !Exploitable un nouvel outil gratuit pour aider les développeurs à évaluer automatiquement les risques
- Webshag, un outil d'audit de serveur web
- Les navigateurs internet, des mini-systèmes d’exploitation hors de contrôle ?
- Yellowsn0w un utilitaire de déblocage SIM pour le firmware 2.2 des Iphone 3G
- CAINE un Live[CD|USB] pour faciliter la recherche légale de preuves numériques de compromission
- Nessus 4.0 placé sous le signe de la performance, de l'unification et de la personnalisation
- [Renforcement des fonctions de sécurité du noyau Linux – Partie 1] Présentation
- [IDS Snort Windows – Partie 1] Introduction aux IDS et à SNORT
- Origami pour forger, analyser et manipuler des fichiers PDF malicieux

Vulnerability Spotlight Libgraphite Font Processing Vulnerabilities

Si vous voulez bloquer ce service sur vos fils RSS
Si vous voulez nous contacter ou nous proposer un fil RSS

Menu > Articles de la revue de presse : - l'ensemble [tous | francophone] - par mots clé [tous] - par site [tous] - le tagwall [voir] - Top bi-hebdo de la revue de presse [Voir]

S'abonner au fil RSS global de la revue de presse



Vulnerability Spotlight Libgraphite Font Processing Vulnerabilities

Par Security Bloggers Network
Le [2016-02-05] à 23:28:07



Présentation : Vulnerabilities Discovered by Yves Younan of Cisco Talos. Talos is releasing an advisory for four vulnerabilities that have been found within the Libgraphite library, which is used for font processing in Linux, Firefox, OpenOffice, and other major applications. The most severe vulnerability results from an out-of-bounds read which the attacker can use to achieve arbitrary code execution. A second vulnerability is an exploitable heap overflow. Finally, the last two vulnerabilities result in denial of service situations. To exploit these vulnerabilities, an attacker simply needs the user to run a Graphite-enabled application that renders a page using a specially crafted font that triggers one of these vulnerabilities. Since Mozilla Firefox 11 and later versions directly support Graphite, the attacker could easily compromise a server and then serve the specially crafted font when the user renders a page from the server since Graphite supports both local and server-based fonts . In this post, we will discuss the following vulnerabilities CVE-2016-1521 CVE-2016-1522 CVE-2016-1523 CVE-2016-1526 Overview -------- Graphite is a package that can be used to create smart fonts capable of displaying writing systems with various complex behaviors. Basically Graphite s smart fonts are just TrueType Fonts TTF with added extensions. The issues that Talos identified include the following An exploitable denial of service vulnerability exists in the font handling of Libgraphite. A specially crafted font can cause an out-of-bounds read potentially resulting in an information leak or denial of service. A specially crafted font can cause a buffer overflow resulting in potential code execution. An exploitable NULL pointer dereference exists in the bidirectional font handling functionality of Libgraphite. A specially crafted font can cause a NULL pointer dereference resulting in a crash. In each of the situations an attacker can provide a malicious font to trigger the specified vulnerability. Out-of-Bounds Read Details -------------------------- If a malicious font is provided, an out of bounds read can occur while interpreting the opcodes in a font. The problem occurs when executing the various opcodes in the function directrun in the file directmachine.cpp. At line 85, the interpreter for the opcodes will be executed by performing a goto instruction. goto ip If the opcode in particular is a cntxt_item, then ip variable will be advanced by iskip bytes to find the next opcode and continue interpreting the opcodes. This is done at line 369 of opcodes.h. ip iskip However there are no checks to ensure that ip remains within the bounds of the memory allocated for the memory to be interpreted the program variable . In the case of s specially crafted malicious font, the value of iskip can be manipulated to cause an out-of-bound read when the program performs a jump to ip. This memory is memory that was previously allocated for data. This is a serious vulnerability because the out of bounds read causes the TTF virtual machine to execute code under control of the attacker. In an environment like a browser, javascript can place arbitrary bytecode in memory. Joshua jduck Drake showed how to use the TTF virtual machine to create generic memory read write primitives in his pwn2own java exploit last year. Heap Overflow Details --------------------- If a malicious font is provided then an arbitrary length buffer overflow can occur when handling context items. In Code.cpp at lines 158-161, memory is allocated for _code and _data to be the expected maximum size of the code and data loaded from the bytecode. However, the actual size read from the file can be larger than the expected size. 158 _code static_cast malloc bytecode_end - bytecode_begin 159 sizeof instr 160 _data static_cast malloc bytecode_end - bytecode_begin 161 sizeof byte At line 181 the function dec.load is called with pointers to the beginning and end of the bytecode. This function, at lines 230-240, will then load opcodes from the bytecode until the end of the bytecode is reached. It will call emitopcode at line 238 with the current value of the bytecode that is being handled. 230 while bc bc 237 238 if emit_opcode opc, bc 239 return false 240 If the opcode being handled by emitopcode refers to a context item CNTXTITEM . Then the load function will be called recursively at line 500, with a new bytecodeend that is specified by the bytecode in instrskip. if load bc, bc instr_skip The size checks to ensure that data isn t read from outside of the buffer, occur in the validateopcode function at line 548 where it is checked that the new opcode being read will be less than _max.bytecode which contains the value of bytecodeend . However, when recursively handling multiple CNTXTITEMs, this means that while data is being copied to _data, it can be read past the new bytecodeend that is specified by the recursive call to load, this will terminate the loop once it reaches there, but in the meantime more data can be read than specified by instrskip, because when validateopcode is called, the current value of bytecode will still be lower than the end of the bytecode. Doing this multiple times, results in the same memory being handled multiple times and allowing data to become larger than bytecode allowing an out-of-bounds write. The same can occur with the code buffer. A proposed fix is to ensure that when returning from a CNTXTITEM, the current value of bytecode minus the begin value of bytecode is larger or equal to datasize and instrcount. A similar check to what is performed via an assert at lines 210 and 211. Denial of Service Details ------------------------- The first denial of service issue results from a NULL pointer deference. When the font is loaded via grmakefile_face, the function readFeats will be called at line 190 in the file FeatureMap.cpp in the function SillMap readFace. if m_FeatureMap.readFeats face return false At line 110, in the function readFeats, mnumFeats will be assigned the value 0. This results in a return from the readFeats function at line 115. However the return will return the value true. This results in none of the variables in mFeatureMap being initialized even though the font will load without any errors being returned. If the function grmakeseg is later called on this font, the call to SillMap cloneFeatures will fail at line 241 because it tries to dereference mFeatureMap.mdefaultFeatures, which is set to 0. return new Features m_FeatureMap.m_defaultFeatures A similar error can occur at line 103 in the same function if the constructor for Table fails. The second denial of service issue results from an out of bounds read that can not only cause a DoS, but it can also cause a leak of information. When reading an invalid font where the local table size is set to 0, an out of bounds read will occur. At line 187 in GlyphCache.cpp, the function Loader is defined which loads a number of tables from the font, including the loca table. At line 206 it will then call the function TtfUtil LocaLookup with arguments that provide the number of glyphs, the loca table and its size if TtfUtil LocaLookup numglyphsgraphics-1, _loca, _loca.size , _head sizet -1 At line 1164 in this function in file TtfUtil.cpp , the loca table will be accessed using the number of glyphs return be peek pLongTable nGlyphId A size check is performed at line 1161, but since the size is set to 0, this will always pass. if nGlyphId 2 - 1 This will read out of the bounds of the table by an arbitrary 16-byte number, which will cause a denial of service and could potentially lead to an information leak. Known Vulnerable Versions -------------------------- Libgraphite 2-1.2.4Firefox 31 Conclusion ---------- Finding and disclosing zero-day vulnerabilities responsibly helps improve the overall security of the devices and software people use on a day-to-day basis. Talos is committed to this effort via developing programmatic ways to identify problems or flaws that could be otherwise exploited by malicious attackers. These developments help secure the platforms and software customers use and also help provide insight into how Cisco can improve its own processes to develop better products. In addition, Talos has released rules that detect attempts to exploit these vulnerabilities to protect our customers. Please note that additional rules may be released at a future date and current rules are subject to change pending additional vulnerability information. For the most current rule information, please refer to your Defense Center, FireSIGHT Management Center or Snort.org. Snort Rules 36216,36213, 36217 36225-36228 36385-88 For further zero day or vulnerability reports and information visit http talosintel.com vulnerability-reports

Les mots clés de la revue de presse pour cet article : vulnerability
Les videos sur SecuObs pour les mots clés : vulnerability
Les éléments de la revue Twitter pour les mots clé : vulnerability



AddThis Social Bookmark Widget



Les derniers articles du site "Security Bloggers Network" :

- In An Era Of Decline, News Sites Can t Afford Poor Web Performance
- BeautifulPeople.com experiences data breach 1m affected
- Swedish Air Space Infringed, Aircraft Not Required
- Why cybercriminals attack healthcare more than any other industry
- Setting the Benchmark in the Network Security Forensics Industry
- Spotify denies hack users subjected to weird music beg to differ
- The Dangerous Game of DNS
- Threat Recap Week of April 22nd
- Is your security appliance actually FIPS validated
- Deploying SAST Static Application Security Testing




S'abonner au fil RSS global de la revue de presse

Menu > Articles de la revue de presse : - l'ensemble [tous | francophone] - par mots clé [tous] - par site [tous] - le tagwall [voir] - Top bi-hebdo de la revue de presse [Voir]



Si vous voulez bloquer ce service sur vos fils RSS :
- avec iptables "iptables -A INPUT -s 88.190.17.190 --dport 80 -j DROP"
- avec ipfw et wipfw "ipfw add deny from 88.190.17.190 to any 80"
- Nous contacter par mail




SecuToolBox :

Mini-Tagwall des articles publiés sur SecuObs :

Mini-Tagwall de l'annuaire video :

Mini-Tagwall des articles de la revue de presse :

Mini-Tagwall des Tweets de la revue Twitter :