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CVE PROGRAM SOURCE RECORD8.2 High

CVE-2023-53333

netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one Eric Dumazet says: nf_conntrack_dccp_packet() has an unique: dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); And nothing more is 'pulled' from the packet, depending on the content. dh->dccph_doff, and/or dh->dccph_x ...) So dccp_ack_seq() is happily reading stuff past the _dh buffer. BUG: KASAN: stack-out-of-bounds in nf_conntrack_dccp_packet+0x1134/0x11c0 Read of size 4 at addr ffff000128f66e0c by task syz-executor.2/29371 [..] Fix this by increasing the stack buffer to also include room for the extra sequence numbers and all the known dccp packet type headers, then pull again after the initial validation of the basic header. While at it, mark packets invalid that lack 48bit sequence bit but where RFC says the type MUST use them. Compile tested only. v2: first skb_header_pointer() now needs to adjust the size to only pull the generic header. (Eric) Heads-up: I intend to remove dccp conntrack support later this year.

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

  • 2bc780499aa33311ec0f3e42624dfaa7be0ade5e to < 337fdce450637ea663bc816edc2ba81e5cdad02eaffected
  • 2bc780499aa33311ec0f3e42624dfaa7be0ade5e to < 9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8affected
  • 2bc780499aa33311ec0f3e42624dfaa7be0ade5e to < c052797ac36813419ad3bfa54cb8615db4b41f15affected
  • 2bc780499aa33311ec0f3e42624dfaa7be0ade5e to < 5c618daa5038712c4a4ef8923905a2ea1b8836a1affected
  • 2bc780499aa33311ec0f3e42624dfaa7be0ade5e to < 26bd1f210d3783a691052c51d76bb8a8bbd24c67affected
  • 2bc780499aa33311ec0f3e42624dfaa7be0ade5e to < 8c0980493beed3a80d6329c44ab293dc8c032927affected
  • 2bc780499aa33311ec0f3e42624dfaa7be0ade5e to < ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30affected

Linux Linux

Default version status: affected

  • 2.6.26affected
  • 0 to < 2.6.26unaffected
  • 5.4.251 to ≤ 5.4.*unaffected
  • 5.10.188 to ≤ 5.10.*unaffected
  • 5.15.121 to ≤ 5.15.*unaffected
  • 6.1.39 to ≤ 6.1.*unaffected
  • 6.3.13 to ≤ 6.3.*unaffected
  • 6.4.4 to ≤ 6.4.*unaffected
  • 6.5 to ≤ *unaffected

References