- Vulnerability/
- USN-6881-1
USN-6881-1: Exim vulnerability
First published: Mon Jul 08 2024(Updated: )
It was discovered that Exim did not enforce STARTTLS sync point on client side. An attacker could possibly use this issue to perform response injection during MTA SMTP sending.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/exim4 | <4.93-13ubuntu1.11 | 4.93-13ubuntu1.11 |
| Ubuntu | =20.04 | |
| All of | ||
| ubuntu/exim4-base | <4.93-13ubuntu1.11 | 4.93-13ubuntu1.11 |
| Ubuntu | =20.04 | |
| All of | ||
| ubuntu/eximon4 | <4.93-13ubuntu1.11 | 4.93-13ubuntu1.11 |
| Ubuntu | =20.04 | |
| All of | ||
| ubuntu/exim4 | <4.90.1-1ubuntu1.10+esm4 | 4.90.1-1ubuntu1.10+esm4 |
| Ubuntu | =18.04 | |
| All of | ||
| ubuntu/exim4-base | <4.90.1-1ubuntu1.10+esm4 | 4.90.1-1ubuntu1.10+esm4 |
| Ubuntu | =18.04 | |
| All of | ||
| ubuntu/eximon4 | <4.90.1-1ubuntu1.10+esm4 | 4.90.1-1ubuntu1.10+esm4 |
| Ubuntu | =18.04 | |
| All of | ||
| ubuntu/exim4 | <4.86.2-2ubuntu2.6+esm7 | 4.86.2-2ubuntu2.6+esm7 |
| Ubuntu | =16.04 | |
| All of | ||
| ubuntu/exim4-base | <4.86.2-2ubuntu2.6+esm7 | 4.86.2-2ubuntu2.6+esm7 |
| Ubuntu | =16.04 | |
| All of | ||
| ubuntu/eximon4 | <4.86.2-2ubuntu2.6+esm7 | 4.86.2-2ubuntu2.6+esm7 |
| Ubuntu | =16.04 | |
| All of | ||
| ubuntu/exim4 | <4.82-3ubuntu2.4+esm8 | 4.82-3ubuntu2.4+esm8 |
| Ubuntu | =14.04 | |
| All of | ||
| ubuntu/exim4-base | <4.82-3ubuntu2.4+esm8 | 4.82-3ubuntu2.4+esm8 |
| Ubuntu | =14.04 | |
| All of | ||
| ubuntu/eximon4 | <4.82-3ubuntu2.4+esm8 | 4.82-3ubuntu2.4+esm8 |
| Ubuntu | =14.04 |
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Reference Links
Frequently Asked Questions
What is the severity of USN-6881-1?
The severity of USN-6881-1 is considered medium due to the potential for response injection during MTA SMTP sending.
How do I fix USN-6881-1?
To fix USN-6881-1, upgrade Exim to version 4.93-13ubuntu1.11 or later for Ubuntu 20.04, or apply the specific upgrades for other affected versions.
What is the impact of USN-6881-1?
The impact of USN-6881-1 allows attackers to perform response injection due to the lack of STARTTLS sync point enforcement.
Which systems are affected by USN-6881-1?
USN-6881-1 affects multiple versions of Exim on Ubuntu systems including versions 20.04, 18.04, 16.04, and 14.04.
Is there a workaround for USN-6881-1?
As of now, there is no official temporary workaround for USN-6881-1 other than upgrading to the patched version.
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