An issue was discovered in mod_alias_physical_handler in mod_alias.c in lighttpd before 1.4.50. There is potential ../ path traversal of a single directory above an alias target, with a specific mod_alias configuration where the matched alias lacks a trailing '/' character, but the alias target filesystem path does have a trailing '/' character.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
| Link | Tags |
|---|---|
| https://github.com/lighttpd/lighttpd1.4/commit/2105dae0f9d7a964375ce681e53cb165375f84c1 | exploit vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00054.html | mailing list third party advisory vendor advisory |
| https://lists.debian.org/debian-lts-announce/2022/01/msg00012.html | third party advisory mailing list |