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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.12, < 4.4.274 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4Patch
- https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915Patch
- https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1Patch
- https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98Patch
- https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0bPatch
- https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02Patch
- https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8Patch
- https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96bPatch
- https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4Patch
- https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915Patch
- https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1Patch
- https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98Patch
- https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0bPatch
- https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02Patch
- https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8Patch
FAQ
What is CVE-2021-47245?
CVE-2021-47245 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 r...
How severe is CVE-2021-47245?
CVE-2021-47245 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47245?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.