| 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-2024-42098: crypto: ecdh - explicitly zeroize private_key |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| crypto: ecdh - explicitly zeroize private_key |
| |
| private_key is overwritten with the key parameter passed in by the |
| caller (if present), or alternatively a newly generated private key. |
| However, it is possible that the caller provides a key (or the newly |
| generated key) which is shorter than the previous key. In that |
| scenario, some key material from the previous key would not be |
| overwritten. The easiest solution is to explicitly zeroize the entire |
| private_key array first. |
| |
| Note that this patch slightly changes the behavior of this function: |
| previously, if the ecc_gen_privkey failed, the old private_key would |
| remain. Now, the private_key is always zeroized. This behavior is |
| consistent with the case where params.key is set and ecc_is_key_valid |
| fails. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42098 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.15.162 with commit 39173b04abda87872b43c331468a4a14f8f05ce8 |
| Fixed in 6.1.97 with commit fd7ef325911eba1b7191b83cb580463242f2090d |
| Fixed in 6.6.37 with commit 80575b252ab0358b7e93895b2a510beb3cb3f975 |
| Fixed in 6.9.8 with commit d96187eb8e59b572a8e6a68b6a9837a867ea29df |
| Fixed in 6.10 with commit 73e5984e540a76a2ee1868b91590c922da8c24c9 |
| |
| 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-2024-42098 |
| 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: |
| crypto/ecdh.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/39173b04abda87872b43c331468a4a14f8f05ce8 |
| https://git.kernel.org/stable/c/fd7ef325911eba1b7191b83cb580463242f2090d |
| https://git.kernel.org/stable/c/80575b252ab0358b7e93895b2a510beb3cb3f975 |
| https://git.kernel.org/stable/c/d96187eb8e59b572a8e6a68b6a9837a867ea29df |
| https://git.kernel.org/stable/c/73e5984e540a76a2ee1868b91590c922da8c24c9 |
