Some Synology products impacted by recently disclosed OpenSSL flaws
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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Taiwan vendor Synology announced that recently disclosed vulnerabilities (CVE-2021-3711 and CVE-2021-3712) in the OpenSSL impact some of its products.
Taiwanese company Synology revealed that the recently disclosed remote code execution (RCE) and denial-of-service (DoS) OpenSSL vulnerabilities (CVE-2021-3711 and CVE-2021-3712) 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 |
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).
Synology is expected to address both flaws with security updates, but it does not provide an estimated timeline for their release. Synology is not aware of attacks in the wild exploiting the above vulnerabilities.
Recently the vendor also published another advisory to warn of vulnerabilities in DiskStation Manager.
“Multiple vulnerabilities allow remote authenticated users to execute arbitrary commands, or remote attackers to write arbitrary files via a susceptible version of DiskStation Manager (DSM).” reads the advisory published by the company.
Below is the list of affected products:
| Product | Severity | Fixed Release Availability |
|---|---|---|
| DSM 7.0 | Important | Ongoing |
| DSM 6.2 | Important | Upgrade to 6.2.4-25556-2 or above. |
| DSM UC | Moderate | Pending |
| SkyNAS | Important | Pending |
| VS960HD | Moderate | Pending |
Early this month, the company PSIRT warned customers that the StealthWorker botnet is conducting brute-force attacks in an attempt to implant ransomware. Once compromised the device, threat actors employed it in a botnet used in attacks aimed at Linux systems, including Synology NAS.
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