OSVDB ID: 25851 Title: FreeBSD SMBFS Traversal chroot Bypass |
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Description |
FreeBSD contains a flaw that allows a remote attacker to escape a chroot environment when the chroot is implemented over a Server Message Block File System (SMBFS). The issue is due to the SMBFS not properly sanitizing user input, specifically directory traversal style attacks (..\). This flaw may lead to a loss of integrity. |
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Location:
Local Access Required,
Remote/Network Access Required
Attack Type: Input Manipulation Impact: Loss of Integrity Exploit: Exploit Available Disclosure: OSVDB Verified |
Solution |
Upgrade to version 4.11, 5.5 or 6.1 or higher, as it has been reported to fix this vulnerability. In addition, FreeBSD has released a patch for some older versions. It is also possible to correct the flaw by implementing the following workaround: mount the SMBFS so that the chroot directory is on a mount point and not a subdirectory of a mount point. |
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