CVE-2021-47245
Linux Netfilter Synproxy TCP Option Parsing Out-of-Bounds Read Vulnerability
Description
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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
May 21, 2024, 4:54 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2021-47245
.
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The following list is the news that have been mention
CVE-2021-47245
vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47245
vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47245
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47245
weaknesses.