National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-14842 Detail

Description

Structured reply is a feature of the newstyle NBD protocol allowing the server to send a reply in chunks. A bounds check which was supposed to test for chunk offsets smaller than the beginning of the request did not work because of signed/unsigned confusion. If one of these chunks contains a negative offset then data under control of the server is written to memory before the read buffer supplied by the client. If the read buffer is located on the stack then this allows the stack return address from nbd_pread() to be trivially modified, allowing arbitrary code execution under the control of the server. If the buffer is located on the heap then other memory objects before the buffer can be overwritten, which again would usually lead to arbitrary code execution.

Source:  MITRE

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score: N/A
NVD score not yet provided.

Nist CVSS score does not match with CNA score
CNA:  Red Hat, Inc.
Base Score: 7.3 HIGH
Vector:  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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Hyperlink Resource
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14842
https://www.redhat.com/archives/libguestfs/2019-October/msg00060.html

Weakness Enumeration

CWE-ID CWE Name Source
CWE-20 Improper Input Validation Red Hat, Inc.  

Quick Info

CVE Dictionary Entry:
CVE-2019-14842
NVD Published Date:
11/26/2019
NVD Last Modified:
11/26/2019