| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47245: netfilter: synproxy: Fix out of bounds when parsing TCP options |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47245 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 4.4.274 with commit e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 4.9.274 with commit 576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 4.14.238 with commit 674b5f0c6a4fc5d3abce877048290cea6091fcb1 |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 4.19.196 with commit 7d9a9a1a88a3da574e019b4de756bc73337b3b0b |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 5.4.128 with commit 6defc77d48eff74075b80ad5925061b2fc010d98 |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 5.10.46 with commit 9cdf299ba4e153b5e56187648420de22c6216f02 |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 5.12.13 with commit f648089337cb8ed40b2bb96e244f72b9d97dc96b |
| Issue introduced in 3.12 with commit 48b1de4c110a7afa4b85862f6c75af817db26fad and fixed in 5.13 with commit 5fc177ab759418c9537433e63301096e733fb915 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47245 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/netfilter/nf_synproxy_core.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 |
| https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 |
| https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 |
| https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b |
| https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 |
| https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 |
| https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b |
| https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 |
