CVE-2021-47245
netfilter: synproxy: Fix out of bounds when parsing TCP options
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
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 <0 para evitar llamar a skb_header_pointer con una longitud negativa.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-04-10 CVE Reserved
- 2024-05-21 CVE Published
- 2024-05-22 EPSS Updated
- 2024-11-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (9)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/48b1de4c110a7afa4b85862f6c75af817db26fad | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 4.4.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 4.4.274" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 4.9.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 4.9.274" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 4.14.238 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 4.14.238" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 4.19.196 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 4.19.196" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 5.4.128 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 5.4.128" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 5.10.46 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 5.10.46" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 5.12.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 5.12.13" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.12 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.12 < 5.13" | en |
Affected
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