CVE-2023-25136

MEDIUM(6.5)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Risk Signal Score43/100 — MITTEL

CVSS 6.5 — Mittel
EPSS 88% — sehr wahrscheinlich ausgenutzt

EPSS-Score

88%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

6.5

Technische Schwere

Beschreibung

OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states "remote code execution is theoretically possible."

Referenzen

http://www.openwall.com/lists/oss-security/2023/02/13/1
http://www.openwall.com/lists/oss-security/2023/02/22/1
http://www.openwall.com/lists/oss-security/2023/02/22/2
http://www.openwall.com/lists/oss-security/2023/02/23/3
http://www.openwall.com/lists/oss-security/2023/03/06/1
http://www.openwall.com/lists/oss-security/2023/03/09/2
https://bugzilla.mindrot.org/show_bug.cgi?id=3522
https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig
https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc...
https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-p...