CVE-2017-8335

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Summary

CVECVE-2017-8335
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2019-06-18 19:15:00 UTC
Updated2019-06-20 20:55:00 UTC
DescriptionAn issue was discovered on Securifi Almond, Almond+, and Almond 2015 devices with firmware AL-R096. The device provides a user with the capability of setting name for wireless network. These values are stored by the device in NVRAM (Non-volatile RAM). It seems that the POST parameters passed in this request to set up names on the device do not have a string length check on them. This allows an attacker to send a large payload in the "mssid_1" POST parameter. The device also allows a user to view the name of the Wifi Network set by the user. While processing this request, the device calls a function named "getCfgToHTML" at address 0x004268A8 which retrieves the value set earlier by "mssid_1" parameter as SSID2 and this value then results in overflowing the stack set up for this function and allows an attacker to control $ra register value on the stack which allows an attacker to control the device by executing a payload of an attacker's choice. If the firmware version AL-R096 is dissected using binwalk tool, we obtain a cpio-root archive which contains the filesystem set up on the device that contains all the binaries. The binary "goahead" is the one that has the vulnerable function that recieves the values sent by the POST request. If we open this binary in IDA-pro we will notice that this follows a MIPS little endian format. The function sub_00420F38 in IDA pro is identified to be receiving the values sent in the POST parameter "mssid_1" at address 0x0042BA00 and then sets in the NVRAM at address 0x0042C314. The value is later retrieved in the function "getCfgToHTML" at address 0x00426924 and this results in overflowing the buffer due to "strcat" function that is utilized by this function.

Risk And Classification

Problem Types: CWE-119

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Securifi Almond - All All All
Hardware Securifi Almond - All All All
Hardware Securifi Almond - All All All
Operating System Securifi Almond Firmware al-r096 All All All
Hardware Securifi Almond - All All All
Hardware Securifi Almond - All All All
Operating System Securifi Almond Firmware al-r096 All All All
Operating System Securifi Almond Firmware al-r096 All All All
Hardware Securifi Almond 2015 - All All All
Hardware Securifi Almond 2015 - All All All
Operating System Securifi Almond 2015 Firmware al-r096 All All All
Operating System Securifi Almond 2015 Firmware al-r096 All All All
Operating System Securifi Almond Firmware al-r096 All All All
Operating System Securifi Almond Firmware al-r096 All All All

References

ReferenceSourceLinkTags
IoT_vulnerabilities/Securifi_Almond_plus_sec_issues.pdf at master · ethanhunnt/IoT_vulnerabilities · GitHub MISC github.com Exploit, Third Party Advisory
Bugtraq: Newly releases IoT security issues BUGTRAQ seclists.org Mailing List, Third Party Advisory
Securifi Almond 2015 Buffer Overflow / Command Injection / XSS / CSRF ≈ Packet Storm MISC packetstormsecurity.com Third Party Advisory, VDB Entry
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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