QNAP will patche OpenSSL flaws in its NAS devices
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2021-3711 +1 in the same advisory: …3712 | In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the "out" parameter can be NULL and, on exit, the "outlen" parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the "out" parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attacker who is able present SM2 content for decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of 62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k). NVD description · AI analysis pending | 9.8 group max | 88% |
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Full article360 words · extracted from securityaffairs.com · click to collapse
Pierluigi Paganini
September 01, 2021
Network-attached storage (NAS) appliance maker QNAP is working on security patches for its products affected by recently fixed OpenSSL flaws.
Taiwanese Network-attached storage (NAS) appliance maker QNAP announced that it is assessing the potential impact of two recently addressed flaws in OpenSSL on its products. The company also announced that it is working on security updates that address these vulnerabilities.
“An out-of-bounds read vulnerability in OpenSSL has been reported to affect QNAP NAS running QTS, QuTS hero, and QuTScloud. If exploited, the vulnerability allows remote attackers to disclose memory data or execute a denial-of-service (DoS) attack.” reads the advisory published by QNAP. “QNAP is thoroughly investigating the case. We will release security updates and provide further information as soon as possible.”
The two vulnerabilities are CVE-2021-3711 and CVE-2021-3712, they are respectively a remote code execution (RCE) and denial-of-service (DoS).
The CVE-2021-3711 is a high-severity buffer overflow flaw that could allow an attacker to change an application’s behavior or cause the app to crash. The vulnerability ties the decryption of SM2 encrypted data, the changes depend on the targeted application and data it maintains (i.e. credentials) in the heap while the issue is exploited.
The CVE-2021-3712 is a medium-severity vulnerability that can be exploited by attackers to trigger a denial-of-service (DoS) condition. The flaw could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext).
A few days ago, Taiwan vendor Synology also announced that the above vulnerabilities in the OpenSSL impact some of its products.
“Multiple vulnerabilities allow remote attackers to conduct denial-of-service attack or possibly execute arbitrary code via a susceptible version of Synology DiskStation Manager (DSM), Synology Router Manager (SRM), VPN Plus Server or VPN Server.” reads the advisory published by the company.
The affected Synology products are:
| PRODUCT | SEVERITY | FIXED RELEASE AVAILABILITY |
|---|---|---|
| DSM 7.0 | Important | Ongoing |
| DSM 6.2 | Moderate | Ongoing |
| DSM UC | Moderate | Ongoing |
| SkyNAS | Moderate | Pending |
| VS960HD | Moderate | Pending |
| SRM 1.2 | Moderate | Ongoing |
| VPN Plus Server | Important | Ongoing |
| VPN Server | Moderate | Ongoing |
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Text extracted automatically; images, tables and formatting may be missing. Original: https://securityaffairs.com/121724/iot/qnap-openssl-nas.html