Improper Input Validation Affecting python-gnupg package, versions [,0.4.4)
Snyk CVSS
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Test your applications- Snyk ID SNYK-PYTHON-PYTHONGNUPG-73633
- published 30 Jan 2019
- disclosed 24 Jan 2019
- credit Alexander Kjall and Stig Palmquis
Introduced: 24 Jan 2019
CVE-2019-6690 Open this link in a new tabHow to fix?
Upgrade python-gnupg to version 0.4.4 or higher.
Overview
python-gnupg is a command-line program which provides support for programmatic access via spawning a separate process to run it and then communicating with that process from your program.
Affected versions of this package are vulnerable to Improper Input Validation. An attacker can inject data through the passphrase property of the gnupg.GPG.encrypt() and gnupg.GPG.decrypt() methods when symmetric encryption is used.
The supplied passphrase is not validated for newlines, and the library passes --passphrase-fd=0 to the gpg executable, which expects the passphrase on the first line of stdin, and the ciphertext to be decrypted or plaintext to be encrypted on subsequent lines.
By supplying a passphrase containing a newline an attacker can control/modify the ciphertext/plaintext being decrypted/encrypted.