gzip

CommentThere are also a number of other utilities that rely on gzip under the hood, e.g., zless, zcat, gunzip, etc. Besides having similar features, they also allow privileged reads if gzip itself is SUID.

File read

This executable can read data from local files.

Unprivileged
This function can be performed by any unprivileged user.
```
gzip -c /path/to/input-file | gzip -d
```
Sudo
This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
RemarksIf there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....
```
gzip -c /path/to/input-file | gzip -d
```
SUID
This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
```
gzip -c /path/to/input-file | gzip -d
```
Capabilities
This function is performed bypassing the usual kernel permission checks if the executable has certain capabilities set.
RemarksThe following capabilities are needed: CAP_DAC_OVERRIDE.
```
gzip -c /path/to/input-file | gzip -d
```