CVE-2017-13719: 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 ...

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

EPSS Probability

4.46%

90.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Amcrest	Ipm-721s Firmware	amcrest_ipc-awxx_eng_n_v2.420.ac00.17.r.20170322

References

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

Timeline

Published: Jul 3, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-13719?

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.

How severe is CVE-2017-13719?

Severity scoring for CVE-2017-13719 is pending analysis. The EPSS model estimates a 4.46% probability of exploitation in the next 30 days.

How do I fix CVE-2017-13719?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.