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| author | Jo-Philipp Wich <jo@mein.io> | 2018-11-14 13:37:51 +0100 |
|---|---|---|
| committer | Jo-Philipp Wich <jo@mein.io> | 2018-11-14 20:46:04 +0100 |
| commit | 6f7736c436e1759098102859559f1313ad0669db (patch) | |
| tree | e75ebe417e764c0b9220c2e76719f37e486393d5 /modules | |
| parent | aa2e0e2488f52b2b0acd1746ee13c7f51377f757 (diff) | |
luci-mod-system: prevent comment injection in mtdbackup endpoint
Rework the parameter handling to both prevent a crash when no parameter is
given and to prevent root command injection through the mtd index part of
the parameter value.
Fixes: 9840d310e ("modules: add backup module for mtdblock devices")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Diffstat (limited to 'modules')
| -rw-r--r-- | modules/luci-mod-system/luasrc/controller/admin/system.lua | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/modules/luci-mod-system/luasrc/controller/admin/system.lua b/modules/luci-mod-system/luasrc/controller/admin/system.lua index 4e83769ee..8d9305f4f 100644 --- a/modules/luci-mod-system/luasrc/controller/admin/system.lua +++ b/modules/luci-mod-system/luasrc/controller/admin/system.lua @@ -319,9 +319,13 @@ function action_backup() end function action_backupmtdblock() - local http = require "luci.http" - local mv = http.formvalue("mtdblockname") - local m, s, n = mv:match('^([^%s]+)/([^%s]+)/([^%s]+)') + local mv = luci.http.formvalue("mtdblockname") or "" + local m, n = mv:match('^([^%s%./"]+)/%d+/(%d+)$') + + if not m and n then + luci.http.status(400, "Bad Request") + return + end local reader = ltn12_popen("dd if=/dev/mtd%s conv=fsync,notrunc 2>/dev/null" % n) |