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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
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- Flexera Software Les utilisateurs français de PC progressent dans l'application de correctifs logiciels, mais des défis de tailles subsistent
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- Fujitsu multi-récompensé VMware lui décerne plusieurs Partner Innovation Awards à l'occasion du Partner Leadership Summit
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- 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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Revue de presse internationale :
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Linux NULL pointer dereference due to incorrect proto_ops initializations CVE-2009-2692

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Linux NULL pointer dereference due to incorrect proto_ops initializations CVE-2009-2692

Par cr0 blog
Le [2009-08-13] à 21:37:00



Présentation : Tavis Ormandy and myself have recently found and investigated a Linux kernel vulnerability. It affects all 2.4 and 2.6 kernels since 2001 on all architectures. We believe this is the public vulnerability affecting the greatest number of kernel versions. Since it leads to the kernel executing code at NULL, the vulnerability is as trivial as it can get to exploit an attacker can just put code in the first page that will get executed with kernel privileges. Our exploit took a few minutes to adapt from a previous one . leeches ------------------------------------------------------ sendpage linux local ring0 ---------------- taviso sdf.lonestar.org, julien cr0.org leeches.c Aug 11 2009 GreetZ LiquidK, lcamtuf, Spoonm, novocainated, asiraP, ScaryBeasts, spender, pipacs, stealth, jagger, redpig, Neel and all the other leeches we forgot to mention Enjoy some photography while at ring0 http flickr.com meder For our webapp friends, here is an XSS executing at ring 0 javascript alert 1 shellcode now executing chmod bin sh , 04755 , welcome to ring0 Killed sh id uid 1000 julien gid 1000 julien euid 0 root groups 4 adm ,20 dialout ,24 cdrom ,25 floppy ,29 audio ,30 dip ,44 video ,46 plugdev ,107 fuse ,109 lpadmin ,115 admin ,1000 julien This issue could be mitigated by three things the recent mmap_min_addr feature. Note that this feature has known issues until at least 2.6.30.2. See also this LWN article. on IA32 with PaX GrSecurity, the KERNEXEC feature not implementing affected protocols aka, reducing your attack surface by disabling useless stuff PF_APPLETALK, PF_IPX, PF_IRDA, PF_X25, PF_AX25, PF_BLUETOOTH, PF_IUCV, IPPROTO_SCTP PF_INET6, PF_PPPOX, PF_ISDN, but there may be more This patch should be applied to fix this issue. Below is our advisory Linux NULL pointer dereference due to incorrect proto_ops initializations ------------------------------------------------------------------------- In the Linux kernel, each socket has an associated struct of operations called proto_ops which contain pointers to functions implementing various features, such as accept, bind, shutdown, and so on. If an operation on a particular socket is unimplemented, they are expected to point the associated function pointer to predefined stubs, for example if the accept operation is undefined it would point to sock_no_accept . However, we have found that this is not always the case and some of these pointers are left uninitialized. This is not always a security issue, as the kernel validates the pointers at the call site, such as this example from sock_splice_read static ssize_t sock_splice_read struct file file, loff_t ppos, struct pipe_inode_info pipe, size_t len, unsigned int flags struct socket sock file-private_data if unlikely sock-ops-splice_read return -EINVAL return sock-ops-splice_read sock, ppos, pipe, len, flags However, we have found an example where this is not the case the sock_sendpage routine does not validate the function pointer is valid before dereferencing it, and therefore relies on the correct initialization of the proto_ops structure. We have identified several examples where the initialization is incomplete - The SOCKOPS_WRAP macro defined in include linux net.h, which appears correct at first glance, was actually affected. This includes PF_APPLETALK, PF_IPX, PF_IRDA, PF_X25 and PF_AX25 families. - Initializations where missing in other protocols, including PF_BLUETOOTH, PF_IUCV, PF_INET6 with IPPROTO_SCTP , PF_PPPOX and PF_ISDN. -------------------- Affected Software ------------------------ All Linux 2.4 2.6 versions since May 2001 are believed to be affected - Linux 2.4, from 2.4.4 up to and including 2.4.37.4 - Linux 2.6, from 2.6.0 up to and including 2.6.30.4 -------------------- Consequences ----------------------- This issue is easily exploitable for local privilege escalation. In order to exploit this, an attacker would create a mapping at address zero containing code to be executed with privileges of the kernel, and then trigger a vulnerable operation using a sequence like this ... int fdin mkstemp template int fdout socket PF_PPPOX, SOCK_DGRAM, 0 unlink template ftruncate fdin, PAGE_SIZE sendfile fdout, fdin, NULL, PAGE_SIZE ... Please note, sendfile is just one of many ways to cause a sendpage operation on a socket. Successful exploitation will lead to complete attacker control of the system. ------------------- Mitigation ----------------------- Recent kernels with mmap_min_addr support may prevent exploitation if the sysctl vm.mmap_min_addr is set above zero. However, administrators should be aware that LSM based mandatory access control systems, such as SELinux, may alter this functionality. It should also be noted that all kernels up to 2.6.30.2 are vulnerable to published attacks against mmap_min_addr. ------------------- Solution ----------------------- Linus committed a patch correcting this issue on 13th August 2009. ------------------- Credit ----------------------- This bug was discovered by Tavis Ormandy and Julien Tinnes of the Google Security Team.

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