On such operating systems, an attacker could execute arbitrary commands with the privileges of the script. This script is distributed by some operating systems in a manner where it is automatically executed. The c_rehash script does not properly sanitise shell metacharacters to prevent command injection. Upgrade Debian:10 openssl to version 1.1.1d-0+deb10u7 or higher. The location of the buffer is application dependent but is typically heap allocated. 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. 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 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. 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. 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. Typically an application will call this function twice. In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). See How to fix? for Debian:10 relevant fixed versions and status. Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Debian.
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