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CVE-2020-8617

Status Candidate

Overview

Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.

Related Files

Ubuntu Security Notice USN-4365-2
Posted May 20, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4365-2 - USN-4365-1 fixed several vulnerabilities in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM. Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Bind incorrectly limited certain fetches. A remote attacker could possibly use this issue to cause Bind to consume resources, leading to a denial of service, or possibly use Bind to perform a reflection attack. Various other issues were also addressed.

tags | advisory, remote, denial of service, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-8616, CVE-2020-8617
MD5 | 5b0e56c1eabe20b3f39807b88f195a78
Ubuntu Security Notice USN-4365-1
Posted May 19, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4365-1 - Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Bind incorrectly limited certain fetches. A remote attacker could possibly use this issue to cause Bind to consume resources, leading to a denial of service, or possibly use Bind to perform a reflection attack. Tobias Klein discovered that Bind incorrectly handled checking TSIG validity. A remote attacker could use this issue to cause Bind to crash, resulting in a denial of service, or possibly perform other attacks. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2020-8616, CVE-2020-8617
MD5 | d997e46eed2a4a36615bb449b70ab0cb
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