CVE-2018-14633

HIGH

Description

A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.

References

http://www.securityfocus.com/bid/105388

https://access.redhat.com/errata/RHSA-2018:3651

https://access.redhat.com/errata/RHSA-2018:3666

https://access.redhat.com/errata/RHSA-2019:1946

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14633

https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92c

https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fe

https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html

https://seclists.org/oss-sec/2018/q3/270

https://usn.ubuntu.com/3775-1/

https://usn.ubuntu.com/3775-2/

https://usn.ubuntu.com/3776-1/

https://usn.ubuntu.com/3776-2/

https://usn.ubuntu.com/3777-1/

https://usn.ubuntu.com/3777-2/

https://usn.ubuntu.com/3777-3/

https://usn.ubuntu.com/3779-1/

https://www.debian.org/security/2018/dsa-4308

Details

Source: MITRE

Published: 2018-09-25

Updated: 2018-11-27

Type: CWE-119

Risk Information

CVSS v2.0

Base Score: 8.3

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:C

Impact Score: 8.5

Exploitability Score: 8.6

Severity: HIGH

CVSS v3.0

Base Score: 7

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

Impact Score: 4.7

Exploitability Score: 2.2

Severity: HIGH