CVE-2017-8335 Memory corruption in n/a
A stack-based buffer overflow in the Securifi Almond router firmware allows remote attackers to execute arbitrary code via a large POST parameter.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2017-8335?
CVE-2017-8335 is a high-severity memory corruption vulnerability in n/a, published on 18 Jun 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
An 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.
Weakness: CWE-119
Which versions are affected by CVE-2017-8335?
It affects 3 products.
Products include Securifi Almond\+firmware, Securifi Almond 2015 Firmware, Securifi Almond Firmware.
How do I fix CVE-2017-8335?
No fix has been published for CVE-2017-8335 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2017-8335 being exploited?
There is no known exploitation of CVE-2017-8335 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-8gcv-7mx7-pfhc.