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Message-ID: <2024102110-CVE-2024-47742-b72d@gregkh> Date: Mon, 21 Oct 2024 14:16:21 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-47742: firmware_loader: Block path traversal Description =========== In the Linux kernel, the following vulnerability has been resolved: firmware_loader: Block path traversal Most firmware names are hardcoded strings, or are constructed from fairly constrained format strings where the dynamic parts are just some hex numbers or such. However, there are a couple codepaths in the kernel where firmware file names contain string components that are passed through from a device or semi-privileged userspace; the ones I could find (not counting interfaces that require root privileges) are: - lpfc_sli4_request_firmware_update() seems to construct the firmware filename from "ModelName", a string that was previously parsed out of some descriptor ("Vital Product Data") in lpfc_fill_vpd() - nfp_net_fw_find() seems to construct a firmware filename from a model name coming from nfp_hwinfo_lookup(pf->hwinfo, "nffw.partno"), which I think parses some descriptor that was read from the device. (But this case likely isn't exploitable because the format string looks like "netronome/nic_%s", and there shouldn't be any *folders* starting with "netronome/nic_". The previous case was different because there, the "%s" is *at the start* of the format string.) - module_flash_fw_schedule() is reachable from the ETHTOOL_MSG_MODULE_FW_FLASH_ACT netlink command, which is marked as GENL_UNS_ADMIN_PERM (meaning CAP_NET_ADMIN inside a user namespace is enough to pass the privilege check), and takes a userspace-provided firmware name. (But I think to reach this case, you need to have CAP_NET_ADMIN over a network namespace that a special kind of ethernet device is mapped into, so I think this is not a viable attack path in practice.) Fix it by rejecting any firmware names containing ".." path components. For what it's worth, I went looking and haven't found any USB device drivers that use the firmware loader dangerously. The Linux kernel CVE team has assigned CVE-2024-47742 to this issue. Affected and fixed versions =========================== Issue introduced in 3.7 with commit abb139e75c2c and fixed in 5.10.227 with commit c30558e6c5c9 Issue introduced in 3.7 with commit abb139e75c2c and fixed in 5.15.168 with commit a77fc4acfd49 Issue introduced in 3.7 with commit abb139e75c2c and fixed in 6.1.113 with commit 3d2411f4edcb Issue introduced in 3.7 with commit abb139e75c2c and fixed in 6.6.54 with commit 7420c1bf7fc7 Issue introduced in 3.7 with commit abb139e75c2c and fixed in 6.10.13 with commit 28f1cd94d3f1 Issue introduced in 3.7 with commit abb139e75c2c and fixed in 6.11.2 with commit 6c4e13fdfcab Issue introduced in 3.7 with commit abb139e75c2c and fixed in 6.12-rc1 with commit f0e5311aa802 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-2024-47742 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: drivers/base/firmware_loader/main.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/c30558e6c5c9ad6c86459d9acce1520ceeab9ea6 https://git.kernel.org/stable/c/a77fc4acfd49fc6076e565445b2bc5fdc3244da4 https://git.kernel.org/stable/c/3d2411f4edcb649eaf232160db459bb4770b5251 https://git.kernel.org/stable/c/7420c1bf7fc784e587b87329cc6dfa3dca537aa4 https://git.kernel.org/stable/c/28f1cd94d3f1092728fb775a0fe26c5f1ac2ebeb https://git.kernel.org/stable/c/6c4e13fdfcab34811c3143a0a03c05fec4e870ec https://git.kernel.org/stable/c/f0e5311aa8022107d63c54e2f03684ec097d1394
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