Target from: CVE Network

Intermediate, Rootable

CVE-2020-7247 / 0.0.0.0

4: Flags (2:system, env, root)
1: Service
3,600 pts

A small and easy target that implements the OpenSMTPD CVE-2020-7247 vulnerability
80%

Level 5 / Junior Securitas

Talio / 498th Place

3: Flags found
1: Service discovered
2,900 pts

I like to hack things

This is a target running a vulnerable OpenSMTPD instance of CVE-2020-7247.

Description

A vulnerability discovered in OpenSMTPD, OpenBSD's mail server was exploitable since May 2018 (commit a8e222352f, "switch smtpd to new grammar") and allows an attacker to execute arbitrary shell commands, as root

Environment details

The system is accessible at 10.0.100.33 and runs OpenSMTPD on Debian Buster on the default port (25/tcp).

Flags can be found at the usual places:

  • /root
  • /etc/passwd gecos
  • /etc/shadow password hash
  • env variable

References

57 Headshots (newer first)

canary, Praise, Caritattriste, c0nfirm, alisa, hackercon101, D4rkZone, michyamrane, snipeXZ, mokrates, darklordbnl, falconsec, 44756D6D506C61796572, BlackAnon, luismtzsilva, ks4v3r, Winsad, L0v3, jaxafed
dogolinho, antonioban, noother, markuche, Twelve, 0xRaef, M4sk0ff, Grosik, 0x1337, sirEgghead, JDgodd, ElleuchX1, Muzec, wonderchild, R4V3N, hacker, g0rchy, jinake, biba22, Pegasus, rootz, M96oL, vvip1337, Wh04m1, r0b0tG4nG, sn1per, TheCyberGeek, galoget, 0xRar, lMinzarl, PufferOverflow

4 Writeups by:

biba22 (en) Not rated!Muzec (en) Not rated!sirEgghead (en) Not rated!hackercon101 (en) Not rated!

Activity Stream

Latest activity on the platform

Talio Discovered the ETSCTF username flag under the /etc/shadow file from CVE-2020-7247 for 1000 points, 56 months ago
Talio Discovered the ETSCTF username gecos flag under the /etc/passwd file from CVE-2020-7247 for 800 points, 56 months ago
Talio Got the /root flag from CVE-2020-7247 for 1000 points, 56 months ago
Talio Connected to the smtp port of CVE-2020-7247 for 100 points, 56 months ago