CVE-2016-4864

H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service DoS via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy...

CVE-2016-4864

CVE-2016-4864 affects H2O web server: versions 2.0.3 and earlier and 2.1.0-beta2 and earlier are vulnerable to a DoS via format string specifiers in template files processed by fastcgi, mruby, proxy, redirect or reproxy. Connected sources confirm this vulnerability class and affected ranges, with...

CVE-2016-4864

H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service DoS via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy...

CVE-2016-4864: Use of Externally-Controlled Format String

H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service DoS via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy...

shopify-scripts: Heap Overflow in fiber_switch triggered from Fiber.transfer

It appears as if my recommendations were ignored in the GitHub issue, so I've repeated the issue here. PoC Fiber.new.transfer 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0 Explanation The cause of this is th...

shopify-scripts: heap use after free in fiber_switch

@ssarong reported an input that triggers a heap use-after-free: https://github.com/mruby/mruby/issues/3619 The issue was addressed upstream in https://github.com/mruby/mruby/commit/15fba69710c7395b4e9523edb191ef84f672fa28...

shopify-scripts: SIGABRT in sym_validate_len - symbol.c:44

File 2 as input causes a sigabrt in mruby. mruby raise an exception in symvalidatelen symbol.c:44 0 0x00000000005d3908 in raise 1 0x00000000005d3b3a in abort 2 0x0000000000415b52 in mrbexcraise mrb=, exc=... at /tmp/mruby/src/error.c:310 3 0x0000000000415c81 in mrbraise mrb=0x94fc10, c=, msg= at...

shopify-scripts: Invalid pointer dereference in OP_ENTER

PoC === The following demonstrates a mruby/sandbox crash: def methodmissing end send...

shopify-scripts: SIGSEGV in array_copy - array.c:71

File 2 as input causes a segfault in mruby. mruby crashes in arycopy array.c:71: Program received signal SIGSEGV, Segmentation fault. 0x000000000040e088 in arraycopy src=, size=, dst= at /tmp/mruby/src/array.c:71 71 dsti = srci; Test platform: Linux 3.16.0-4-amd64 1 SMP Debian 3.16.39-1+deb8u1...

shopify-scripts: Null pointer dereference in OP_ENTER

PoC === The following demonstrates a crash: class A def foo end end class B argv = ary-ptr; gdb p ary $1 = struct RArray 0x0 Test platform ============= Linux Mint 17.3 Cinnamon 64-bit, built with gcc version 4.8.4 Ubuntu 4.8.4-2ubuntu114.04.3 mruby SHA: a14a930c800aa50a191922580d53a2ce09287912...

shopify-scripts: SIGSEGV in mrb_vm_exec

PoC ------------------- The following code triggers the bug attached as testmrbvmexec.rb: def methodmissingmeth,argsyieldmeth,argsend enumfor.next Debug - mirb ------------------- x@x:/Desktop/test/mruby/bin$ gdb -q ./mirb rReading symbols from ./mirb...done. gdb r testmrbvmexec.rb Starting...

shopify-scripts: Heap Buffer Overflow in mrb_hash_keys

@ssarong reported a heap buffer overflow in MRuby: https://github.com/mruby/mruby/issues/3565 The issue was corrected in https://github.com/mruby/mruby/commit/39ca4ef3bcdfec6047647e697f94cb84f2251175...

shopify-scripts: Crash in ary_concat()

The code above raises a segmentation fault both in mruby and mruby-engine N case when nil -do end def eend end ASAN report : line 1:3: '' interpreted as argument prefix ASAN:SIGSEGV ================================================================= ==111090==ERROR: AddressSanitizer: SEGV on unknow...

shopify-scripts: Null pointer dereferences in mrb_get_args

@ssarong reported a null pointer dereference in MRuby: https://github.com/mruby/mruby/issues/3559 The issue was corrected in https://github.com/mruby/mruby/commit/dcbfe7162586eb46e583cb140f4f6cde7ae2b87a...

shopify-scripts: Null pointer dereference in mrb_class

PoC === The following demonstrates a crash: if def class A ensure e rescue 0 end end .map.a Debug info ========== The crash happens due to a null pointer dereference in mrbclass, class.h:50. 50├ return mrbobjptrv-c; Valgrind shows several reads inside free'd blocks. Test platform =============...

shopify-scripts: Garbage collector crash

This github issue-tt != MRBTTFREE' failed. Aborted The issue was reintroduced in ecee8c51b0ad8cddd9e422a3e5105f902d7e2781 and is still present in 051e40c0493f2de332f5439e3230c9fe6958bf1a. The issue is fixed by reverting ecee8c51b0ad8cddd9e422a3e5105f902d7e2781. Thank you, Dinko Galetic Denis Kasa...

shopify-scripts: Null pointer dereference in ary_concat

PoC === The following demonstrates a crash: def f end @a = f &:s Debug info ========== mruby crashes in array.c:260 due to a null pointer dereference. 256│ aryconcatmrbstate mrb, struct RArray a, struct RArray a2 257│ 258│ mrbint len; 259│ 260├ if a2-len ARYMAXSIZE - a-len 261│ mrbraisemrb,...

shopify-scripts: Null pointer dereferences in ary_concat

@ssarong reported a null pointer dereference in MRuby: https://github.com/mruby/mruby/issues/3532 The issue was corrected in https://github.com/mruby/mruby/commit/d35fcf1ea2bfc3933b2f2543265874669feeee95...

shopify-scripts: SIGABRT - mirb and mruby

PoC ------------------- The following code triggers the bug attached as test.rb: def methodmissingm,e self.ff||=00end e Debug - mirb ------------------- x@x:/Desktop/test/mruby/bin$ gdb -q ./mirb Reading symbols from ./mirb...done. gdb r test.rb Starting program: /home/x/Desktop/test/mruby/bin/mi...

shopify-scripts: Use-after-free leading to an invalid pointer dereference

PoC === The following code demonstrates a crash: class A rescue Struct.new.new.toh end end Discussion ========== mruby crashes due to an invalid pointer dereference in vm.c:1692: 1689│ LRESCUE: 1690│ if ci-ridx == 0 goto LSTOP; 1691│ proc = ci-proc; 1692├ irep = proc-body.irep; gdb print ci-proc ...