Michael Casadevall

**Name of the Vulnerable Software and Affected Versions** apt versions prior to 0.7.21 **Description** The issue concerns multiple vulnerabilities in the apt package of the Debian GNU/Linux operating system, which can lead to breaches of confidentiality, integrity, and availability of protected information. These vulnerabilities can be exploited remotely. The problem arises because apt-get does not check for the correct error code from gpgv, causing apt to treat a repository as valid even when it has been signed with a revoked or expired key. This might allow remote attackers to trick apt into installing malicious repositories. **Recommendations** For versions prior to 0.7.21, update to version 0.7.21 or later to resolve the issue. As a temporary workaround, consider restricting the use of apt-get until a patch is available. Avoid using apt-get to install repositories from untrusted sources until the issue is resolved.