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CVE-2023-52603

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.3%
Linux•Linux•Versions : <edff092a59260bf0b0a2eba219cb3da6372c2f9f, <=6.1.*, <e30b52a2ea3d1e0aaee68096957cf90a2f4ec5af, 2.6.12, <e4ce01c25ccbea02a09a5291c21749b1fc358e39, 0, 6.1.77, 6.8, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <7aa33854477d9c346f5560a1a1fcb3fe7783e2a8, <=5.10.*, <=6.6.*, <e4cbc857d75d4e22a1f75446e7480b1f305d8d60, <fd3486a893778770557649fe28afa5e463d4ed07, 5.15.149, <=5.4.*, <=4.19.*, 6.6.16, 6.7.4, 4.19.307, 5.4.269, 5.10.210, <6e2902ecc77e9760a9fc447f56d598383e2372d2, <=*, <=5.15.*, <=6.7.*, <27e56f59bab5ddafbcfe69ad7a4a6ea1279c1b16

Description

In the Linux kernel, the following vulnerability has been resolved: UBSAN: array-index-out-of-bounds in dtSplitRoot Syzkaller reported the following issue: oop0: detected capacity change from 0 to 32768 UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:1971:9 index -2 is out of range for type 'struct dtslot [128]' CPU: 0 PID: 3613 Comm: syz-executor270 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_out_of_bounds+0xdb/0x130 lib/ubsan.c:283 dtSplitRoot+0x8d8/0x1900 fs/jfs/jfs_dtree.c:1971 dtSplitUp fs/jfs/jfs_dtree.c:985 [inline] dtInsert+0x1189/0x6b80 fs/jfs/jfs_dtree.c:863 jfs_mkdir+0x757/0xb00 fs/jfs/namei.c:270 vfs_mkdir+0x3b3/0x590 fs/namei.c:4013 do_mkdirat+0x279/0x550 fs/namei.c:4038 __do_sys_mkdirat fs/namei.c:4053 [inline] __se_sys_mkdirat fs/namei.c:4051 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4051 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcdc0113fd9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb8bc67d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcdc0113fd9 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 RBP: 00007fcdc00d37a0 R08: 0000000000000000 R09: 00007fcdc00d37a0 R10: 00005555559a72c0 R11: 0000000000000246 R12: 00000000f8008000 R13: 0000000000000000 R14: 00083878000000f8 R15: 0000000000000000 </TASK> The issue is caused when the value of fsi becomes less than -1. The check to break the loop when fsi value becomes -1 is present but syzbot was able to produce value less than -1 which cause the error. This patch simply add the change for the values less than 0. The patch is tested via syzbot.

Gravité et risque d'exploitation

CVE-2023-52603 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.29 %, ce qui la place devant 20.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <edff092a59260bf0b0a2eba219cb3da6372c2f9f, <=6.1.*, <e30b52a2ea3d1e0aaee68096957cf90a2f4ec5af, 2.6.12, <e4ce01c25ccbea02a09a5291c21749b1fc358e39, 0, 6.1.77, 6.8, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <7aa33854477d9c346f5560a1a1fcb3fe7783e2a8, <=5.10.*, <=6.6.*, <e4cbc857d75d4e22a1f75446e7480b1f305d8d60, <fd3486a893778770557649fe28afa5e463d4ed07, 5.15.149, <=5.4.*, <=4.19.*, 6.6.16, 6.7.4, 4.19.307, 5.4.269, 5.10.210, <6e2902ecc77e9760a9fc447f56d598383e2372d2, <=*, <=5.15.*, <=6.7.*, <27e56f59bab5ddafbcfe69ad7a4a6ea1279c1b16) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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