Description

The Amcrest IPM-721S Amcrest_IPC-AWXX_Eng_N_V2.420.AC00.17.R.20170322 allows HTTP requests that permit enabling various functionalities of the camera by using HTTP APIs, instead of the web management interface that is provided by the application. This HTTP API receives the credentials as base64 encoded in the Authorization HTTP header. However, a missing length check in the code allows an attacker to send a string of 1024 characters in the password field, and allows an attacker to exploit a memory corruption issue. This can allow an attacker to circumvent the account protection mechanism and brute force the credentials. If the firmware version Amcrest_IPC-AWXX_Eng_N_V2.420.AC00.17.R.20170322 is dissected using the binwalk tool, one obtains a _user-x.squashfs.img.extracted archive which contains the filesystem set up on the device that has many of the binaries in the /usr folder. The binary "sonia" is the one that has the vulnerable function that performs the credential check in the binary for the HTTP API specification. If we open this binary in IDA Pro we will notice that this follows an ARM little-endian format. The function at address 00415364 in IDA Pro starts the HTTP authentication process. This function calls another function at sub_ 0042CCA0 at address 0041549C. This function performs a strchr operation after base64 decoding the credentials, and stores the result on the stack, which results in a stack-based buffer overflow.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  9.8 CRITICAL

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

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score:  7.5 HIGH

Vector:  (AV:N/AC:L/Au:N/C:P/I:P/A:P)

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
http://packetstormsecurity.com/files/153224/Amcrest-IPM-721S-Credential-Disclosure-Privilege-Escalation.html	Third Party Advisory  VDB Entry
http://packetstormsecurity.com/files/153224/Amcrest-IPM-721S-Credential-Disclosure-Privilege-Escalation.html	Third Party Advisory  VDB Entry
https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Amcrest_sec_issues.pdf	Exploit  Third Party Advisory
https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Amcrest_sec_issues.pdf	Exploit  Third Party Advisory
https://seclists.org/bugtraq/2019/Jun/8	Mailing List  Third Party Advisory
https://seclists.org/bugtraq/2019/Jun/8	Mailing List  Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-119	Improper Restriction of Operations within the Bounds of a Memory Buffer	NIST

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Change History

3 change records found show changes

CVE Modified by CVE 11/20/2024 10:11:30 PM

Action	Type	Old Value	New Value
Added	Reference		http://packetstormsecurity.com/files/153224/Amcrest-IPM-721S-Credential-Disclosure-Privilege-Escalation.html
Added	Reference		https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Amcrest_sec_issues.pdf
Added	Reference		https://seclists.org/bugtraq/2019/Jun/8

CVE Modified by MITRE 5/14/2024 12:21:02 AM

Action	Type	Old Value	New Value

Initial Analysis by NIST 7/17/2019 11:09:44 AM

Action	Type	Old Value	New Value
Added	CVSS V3		AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CVSS V2		(AV:N/AC:L/Au:N/C:P/I:P/A:P)
Added	CWE		CWE-119
Added	CPE Configuration		AND OR *cpe:2.3:o:amcrest:ipm-721s_firmware:amcrest_ipc-awxx_eng_n_v2.420.ac00.17.r.20170322:*:*:*:*:*:*:* OR cpe:2.3:h:amcrest:ipm-721s:-:*:*:*:*:*:*:*
Changed	Reference Type	http://packetstormsecurity.com/files/153224/Amcrest-IPM-721S-Credential-Disclosure-Privilege-Escalation.html No Types Assigned	http://packetstormsecurity.com/files/153224/Amcrest-IPM-721S-Credential-Disclosure-Privilege-Escalation.html Third Party Advisory, VDB Entry
Changed	Reference Type	https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Amcrest_sec_issues.pdf No Types Assigned	https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Amcrest_sec_issues.pdf Exploit, Third Party Advisory
Changed	Reference Type	https://seclists.org/bugtraq/2019/Jun/8 No Types Assigned	https://seclists.org/bugtraq/2019/Jun/8 Mailing List, Third Party Advisory