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CVE PROGRAM SOURCE RECORD8.2 High

CVE-2021-46955

openvswitch: fix stack OOB read while fragmenting IPv4 packets

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix stack OOB read while fragmenting IPv4 packets running openvswitch on kernels built with KASAN, it's possible to see the following splat while testing fragmentation of IPv4 packets: BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60 Read of size 1 at addr ffff888112fc713c by task handler2/1367 CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418 Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 Call Trace: dump_stack+0x92/0xc1 print_address_description.constprop.7+0x1a/0x150 kasan_report.cold.13+0x7f/0x111 ip_do_fragment+0x1b03/0x1f60 ovs_fragment+0x5bf/0x840 [openvswitch] do_execute_actions+0x1bd5/0x2400 [openvswitch] ovs_execute_actions+0xc8/0x3d0 [openvswitch] ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch] genl_family_rcv_msg_doit.isra.15+0x227/0x2d0 genl_rcv_msg+0x287/0x490 netlink_rcv_skb+0x120/0x380 genl_rcv+0x24/0x40 netlink_unicast+0x439/0x630 netlink_sendmsg+0x719/0xbf0 sock_sendmsg+0xe2/0x110 ____sys_sendmsg+0x5ba/0x890 ___sys_sendmsg+0xe9/0x160 __sys_sendmsg+0xd3/0x170 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f957079db07 Code: c3 66 90 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48 RSP: 002b:00007f956ce35a50 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00007f957079db07 RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019 RBP: 00007f956ce35ae0 R08: 0000000000000000 R09: 00007f9558006730 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0 The buggy address belongs to the page: page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fc7 flags: 0x17ffffc0000000() raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected addr ffff888112fc713c is located in stack of task handler2/1367 at offset 180 in frame: ovs_fragment+0x0/0x840 [openvswitch] this frame has 2 objects: [32, 144) 'ovs_dst' [192, 424) 'ovs_rt' Memory state around the buggy address: ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 >ffff888112fc7100: 00 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 ^ ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00 for IPv4 packets, ovs_fragment() uses a temporary struct dst_entry. Then, in the following call graph: ip_do_fragment() ip_skb_dst_mtu() ip_dst_mtu_maybe_forward() ip_mtu_locked() the pointer to struct dst_entry is used as pointer to struct rtable: this turns the access to struct members like rt_mtu_locked into an OOB read in the stack. Fix this changing the temporary variable used for IPv4 packets in ovs_fragment(), similarly to what is done for IPv6 few lines below.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 119bbaa6795a4f4aed46994cc7d9ab01989c87e3 to < b1d7280f9ba1bfdbc3af5bdb82e51f014854f26faffected
  • d543907a4730400f5c5b684c57cb5bbbfd6136ab to < 23e17ec1a5eb53fe39cc34fa5592686d5acd0dacaffected
  • 8387fbac8e18e26a60559adc63e0b7067303b0a4 to < 5a52fa8ad45b5a593ed416adf326538638454ff1affected
  • d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 to < df9e900de24637be41879e2c50afb713ec4e8b2eaffected
  • d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 to < 490ad0a2390442d0a7b8c00972a83dbb09cab142affected
  • d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 to < a1478374b0bda89b4277a8afd39208271faad4beaffected
  • d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 to < d841d3cf5297fde4ce6a41ff35451d0e82917f3eaffected
  • d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 to < b3502b04e84ac5349be95fc033c17bd701d2787aaffected
  • d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 to < 7c0ea5930c1c211931819d83cfb157bff1539a4caffected
  • df9ece1148e2ec242871623dedb004f7a1387125affected
  • 4.4.134 to < 4.4.269affected
  • 4.9.104 to < 4.9.269affected
  • 4.14.45 to < 4.14.233affected
  • 3.16.57 to < 3.17affected

Linux Linux

Default version status: affected

  • 4.16affected
  • 0 to < 4.16unaffected
  • 4.4.269 to ≤ 4.4.*unaffected
  • 4.9.269 to ≤ 4.9.*unaffected
  • 4.14.233 to ≤ 4.14.*unaffected
  • 4.19.191 to ≤ 4.19.*unaffected
  • 5.4.118 to ≤ 5.4.*unaffected
  • 5.10.36 to ≤ 5.10.*unaffected
  • 5.11.20 to ≤ 5.11.*unaffected
  • 5.12.3 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References