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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-47742

firmware_loader: Block path traversal

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < d1768e5535d3ded59f888637016e6f821f4e069faffected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < 9b1ca33ebd05b3acef5b976c04e5e791af93ce1baffected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < c30558e6c5c9ad6c86459d9acce1520ceeab9ea6affected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < a77fc4acfd49fc6076e565445b2bc5fdc3244da4affected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < 3d2411f4edcb649eaf232160db459bb4770b5251affected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < 7420c1bf7fc784e587b87329cc6dfa3dca537aa4affected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < 28f1cd94d3f1092728fb775a0fe26c5f1ac2ebebaffected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < 6c4e13fdfcab34811c3143a0a03c05fec4e870ecaffected
  • abb139e75c2cdbb955e840d6331cb5863e409d0e to < f0e5311aa8022107d63c54e2f03684ec097d1394affected

Linux Linux

Default version status: affected

  • 3.7affected
  • 0 to < 3.7unaffected
  • 4.19.323 to ≤ 4.19.*unaffected
  • 5.4.285 to ≤ 5.4.*unaffected
  • 5.10.227 to ≤ 5.10.*unaffected
  • 5.15.168 to ≤ 5.15.*unaffected
  • 6.1.113 to ≤ 6.1.*unaffected
  • 6.6.54 to ≤ 6.6.*unaffected
  • 6.10.13 to ≤ 6.10.*unaffected
  • 6.11.2 to ≤ 6.11.*unaffected
  • 6.12 to ≤ *unaffected

References