In the Linux kernel, the following vulnerability has been resolved:
ipv4: validate checksum_start before completing checksum
If a packet with bad checksum metadata gets into the ipv4 stack,
skb_checksum_help can corrupt the network header and cause a bunch of
mischief. This was discovered and reported by Paulos, and has been reporoduced
by others independently since. We really shouldn't allow such packets in, but as a defence
in depth measure, let's also check before we complete the checksum.
A more complete validation at input is forthcoming, but needs more work.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 10
https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f14b43ba2a40a
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe683075354dbb
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e332232b3e68822
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6cbc9106e5cbf
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc60db04fe01956
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e09097436416dc8b
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c3e33464746166264334641dc850a36eef7e6326
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd696081e9b6155de0
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://pwn.ai/blog/Pwnescape
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://vercel.com/blog/findings-from-the-1-million-dollar-vercel-sandbox-chall…
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