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).
Find out more about CVE-2021-3711 from the MITRE-CVE dictionary and NIST NVD
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| Product Name | Status | Defect | Fixed | Downloads |
|---|---|---|---|---|
| Linux | ||||
| Wind River Linux LTS 17 | Not Vulnerable | -- | -- |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux 8 | Requires LTSS | -- | -- |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux 9 | Requires LTSS | -- | -- |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux 7 | Requires LTSS | -- | -- |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux LTS 21 | Fixed |
LIN1021-1316 |
10.21.20.5 |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux LTS 22 | Not Vulnerable | -- | -- | -- |
| Wind River Linux LTS 18 | Fixed |
LIN1018-8090 |
10.18.44.24 |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux LTS 19 | Fixed |
LIN1019-7033 |
10.19.45.19 |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux CD release | Not Vulnerable | -- | -- |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Wind River Linux 6 | Requires LTSS | -- | -- | -- |
| Wind River Linux LTS 23 | Not Vulnerable | -- | -- | -- |
| VxWorks | ||||
| VxWorks 7 | Fixed | -- | 21.11 |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| VxWorks 6.9 | Not Vulnerable | -- | -- |
Wind River VxWorks 20210906 Security Alert for CVE-2021-3711 |
| Helix Virtualization Platform Cert Edition | ||||
| Helix Virtualization Platform Cert Edition | Not Vulnerable | -- | -- | -- |
| Product Name | Status | Defect | Fixed | Downloads |
|---|
