Multiple vulnerabilities have been discovered in Irssi, a terminal-based IRC client which can result in denial of service.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3590-1 advisory.

    It was discovered that Irssi incorrectly handled certain empty nick names. An attacker could possibly use     this issue to cause a denial of service. (CVE-2018-7050)

    It was discovered that Irssi incorrectly handled certain nick names. An attacker could possibly use this     to access sensitive information. (CVE-2018-7051)

    It was discovered that Irssi incorrectly handled an increase in the number of windows. An attacker could     possibly use this issue to cause a denial of service. (CVE-2018-7052)

    It was discovered that Irssi incorrectly handled certain messages. An attacker could possibly use this     issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 16.04 LTS     and Ubuntu 17.10. (CVE-2018-7053)

    It was discovered that Irssi incorrectly handled certain disconnections. An attacker could possibly use     this to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 17.10.
    (CVE-2018-7054)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

New irssi packages are available for Slackware 14.0, 14.1, 14.2, and
-current to fix security issues.

This is new version fixing multiple vulnerabilities: CVE-2018-7050, CVE-2018-7051, CVE-2018-7052, CVE-2018-7053, CVE-2018-7054.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Irssi reports :

Use after free when server is disconnected during netsplits. Found by Joseph Bisch.

Use after free when SASL messages are received in unexpected order.
Found by Joseph Bisch.

NULL pointer dereference when an 'empty' nick has been observed by Irssi. Found by Joseph Bisch.

When the number of windows exceed the available space, Irssi would crash due to NULL pointer dereference. Found by Joseph Bisch.

Certain nick names could result in out of bounds access when printing theme strings. Found by Oss-Fuzz.

This update for irssi fixes the following security issues :

  - CVE-2018-7054: Use after free when server is     disconnected during netsplits

  - CVE-2018-7053: Use after free when SASL messages are     received in unexpected order

  - CVE-2018-7050: NULL pointer dereference when an 'empty'     nick has been observed

  - CVE-2018-7052: When the number of windows exceed the     available space, Irssi would crash due to NULL pointer     dereference

  - CVE-2018-7051: Certain nick names could result in out of     bounds access when printing theme strings

ID	Name	Product	Family	Published	Updated	Severity
108774	Debian DSA-4162-1 : irssi - security update	Nessus	Debian Local Security Checks	4/2/2018	11/22/2024	critical
107193	Ubuntu 14.04 LTS / 16.04 LTS : Irssi vulnerabilities (USN-3590-1)	Nessus	Ubuntu Local Security Checks	3/7/2018	9/3/2025	critical
121144	Slackware 14.0 / 14.1 / 14.2 / current : irssi (SSA:2019-011-01)	Nessus	Slackware Local Security Checks	1/14/2019	6/27/2024	critical
106850	Slackware 14.0 / 14.1 / 14.2 / current : irssi (SSA:2018-046-01)	Nessus	Slackware Local Security Checks	2/16/2018	10/29/2025	critical
107008	Fedora 27 : irssi (2018-433d2dc3c7)	Nessus	Fedora Local Security Checks	2/27/2018	10/27/2025	critical
107013	Fedora 26 : irssi (2018-cbc52e8812)	Nessus	Fedora Local Security Checks	2/27/2018	10/27/2025	critical
106881	FreeBSD : irssi -- multiple vulnerabilities (7afc5e56-156d-11e8-95f2-005056925db4)	Nessus	FreeBSD Local Security Checks	2/20/2018	10/29/2025	critical
106889	openSUSE Security Update : irssi (openSUSE-2018-171)	Nessus	SuSE Local Security Checks	2/20/2018	10/29/2025	critical

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