7.1

CVE-2021-47245

netfilter: synproxy: Fix out of bounds when parsing TCP options

In the Linux kernel, the following vulnerability has been resolved:

netfilter: synproxy: Fix out of bounds when parsing TCP options

The TCP option parser in synproxy (synproxy_parse_options) could read
one byte out of bounds. When the length is 1, the execution flow gets
into the loop, reads one byte of the opcode, and if the opcode is
neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds
the length of 1.

This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack
out of bounds when parsing TCP options.").

v2 changes:

Added an early return when length < 0 to avoid calling
skb_header_pointer with negative length.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.12 < 4.4.274
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.274
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.238
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.196
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.128
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.46
Linux ≫ Linux Kernel Version >= 5.11 < 5.12.13
Linux ≫ Linux Kernel Version5.13 Updaterc1
Linux ≫ Linux Kernel Version5.13 Updaterc2
Linux ≫ Linux Kernel Version5.13 Updaterc3
Linux ≫ Linux Kernel Version5.13 Updaterc4
Linux ≫ Linux Kernel Version5.13 Updaterc5
Linux ≫ Linux Kernel Version5.13 Updaterc6
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.26% 0.175
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.1 1.8 5.2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4
Patch
https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915
Patch
https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1
Patch
https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98
Patch
https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b
Patch
https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02
Patch
https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8
Patch
https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b
Patch