CVE-2021-47245

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47245
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.

7.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
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
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
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
History

30 Dec 2024, 19:03

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 - () https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 - Patch
References () https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 - () https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 - Patch
References () https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 - () https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 - Patch
References () https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 - () https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 - Patch
References () https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b - () https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b - Patch
References () https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 - () https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 - Patch
References () https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 - () https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 - Patch
References () https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b - () https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b - Patch
CPE cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.1
First Time Linux
Linux linux Kernel
CWE CWE-125

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 - () https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 -
References () https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 - () https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 -
References () https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 - () https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 -
References () https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 - () https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 -
References () https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b - () https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b -
References () https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 - () https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 -
References () https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 - () https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 -
References () https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b - () https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b -
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netfilter: synproxy: corrección de límites al analizar opciones TCP. El analizador de opciones TCP en synproxy (synproxy_parse_options) podría leer un byte fuera de los límites. Cuando la longitud es 1, el flujo de ejecución entra en el bucle, lee un byte del código de operación y, si el código de operación no es TCPOPT_EOL ni TCPOPT_NOP, lee un byte más, que excede la longitud de 1. Esta solución está inspirada en la confirmación. 9609dad263f8 ("ipv4: tcp_input: corrige la pila fuera de los límites al analizar las opciones de TCP"). Cambios en v2: se agregó un retorno anticipado cuando la longitud &lt;0 para evitar llamar a skb_header_pointer con una longitud negativa.

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2024-12-30 19:03

NVD link : CVE-2021-47245

Mitre link : CVE-2021-47245

CVE.ORG link : CVE-2021-47245

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-125

Out-of-bounds Read