Ubuntu Security Notice 3527-1 - Joseph Bisch discovered that Irssi incorrectly handled incomplete escape codes. If a user were tricked into using malformed commands or opening malformed files, an attacker could use this issue to cause Irssi to crash, resulting in a denial of service. Joseph Bisch discovered that Irssi incorrectly handled settings the channel topic without specifying a sender. A malicious IRC server could use this issue to cause Irssi to crash, resulting in a denial of service. Various other issues were also addressed.
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Ubuntu Security Notice USN-3527-1
January 10, 2018
irssi vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in Irssi.
Software Description:
- irssi: terminal based IRC client
Details:
Joseph Bisch discovered that Irssi incorrectly handled incomplete escape
codes. If a user were tricked into using malformed commands or opening
malformed files, an attacker could use this issue to cause Irssi to crash,
resulting in a denial of service. (CVE-2018-5205)
Joseph Bisch discovered that Irssi incorrectly handled settings the channel
topic without specifying a sender. A malicious IRC server could use this
issue to cause Irssi to crash, resulting in a denial of service.
(CVE-2018-5206)
Joseph Bisch discovered that Irssi incorrectly handled incomplete variable
arguments. If a user were tricked into using malformed commands or opening
malformed files, an attacker could use this issue to cause Irssi to crash,
resulting in a denial of service. (CVE-2018-5207)
Joseph Bisch discovered that Irssi incorrectly handled completing certain
strings. An attacker could use this issue to cause Irssi to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2018-5208)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.10:
irssi 1.0.4-1ubuntu2.2
Ubuntu 17.04:
irssi 0.8.20-2ubuntu2.3
Ubuntu 16.04 LTS:
irssi 0.8.19-1ubuntu1.6
Ubuntu 14.04 LTS:
irssi 0.8.15-5ubuntu3.4
After a standard system update you need to restart Irssi to make all the
necessary changes.
References:
https://www.ubuntu.com/usn/usn-3527-1
CVE-2018-5205, CVE-2018-5206, CVE-2018-5207, CVE-2018-5208
Package Information:
https://launchpad.net/ubuntu/+source/irssi/1.0.4-1ubuntu2.2
https://launchpad.net/ubuntu/+source/irssi/0.8.20-2ubuntu2.3
https://launchpad.net/ubuntu/+source/irssi/0.8.19-1ubuntu1.6
https://launchpad.net/ubuntu/+source/irssi/0.8.15-5ubuntu3.4