Irssi 0.8.18 before 0.8.21 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via vectors involving strings that are not UTF8.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3184-1 advisory.

    It was discovered that the Irssi buf.pl script set incorrect permissions. A local attacker could use this     issue to retrieve another user's window contents. (CVE-2016-7553)

    Joseph Bisch discovered that Irssi incorrectly handled comparing nicks. A remote attacker could use this     issue to cause Irssi to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2017-5193)

    It was discovered that Irssi incorrectly handled invalid nick messages. A remote attacker could use this     issue to cause Irssi to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2017-5194)

    Joseph Bisch discovered that Irssi incorrectly handled certain incomplete control codes. A remote attacker     could use this issue to cause Irssi to crash, resulting in a denial of service, or possibly execute     arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5195)

    Hanno Bck and Joseph Bisch discovered that Irssi incorrectly handled certain incomplete character     sequences. A remote attacker could use this issue to cause Irssi to crash, resulting in a denial of     service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5196)

    Hanno Bck discovered that Irssi incorrectly handled certain format strings. A remote attacker could use     this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-5356)

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.

This is an security update fixing CVE-2017-5193, CVE-2017-5194, CVE-2017-5195, CVE-2017-5196, CVE-2017-5356.

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.

The remote host is affected by the vulnerability described in GLSA-201701-45 (irssi: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in irssi. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could possibly execute arbitrary code with the       privileges of the process or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

New irssi packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.

irssi was updated to fix four vulnerabilities that could result in denial of service (remote crash) when connecting to malicious servers or receiving specially crafted data. (boo#1018357)

  - CVE-2017-5193: NULL pointer dereference in the nickcmp     function

  - CVE-2017-5194: out of bounds read in certain incomplete     control codes

  - CVE-2017-5195: out of bounds read in certain incomplete     character sequences 

  - CVE-2017-5196: Correct an error when receiving invalid     nick message

Irssi reports :

Five vulnerabilities have been located in Irssi

- A NULL pointer dereference in the nickcmp function found by Joseph Bisch. (CWE-690)

- Use after free when receiving invalid nick message (Issue #466, CWE-146)

- Out of bounds read in certain incomplete control codes found by Joseph Bisch. (CWE-126)

- Out of bounds read in certain incomplete character sequences found by Hanno Bock and independently by J. Bisch. (CWE-126)

- Out of bounds read when Printing the value '%['. Found by Hanno Bock. (CWE-126)

These issues may result in denial of service (remote crash).

ID	Name	Product	Family	Severity
96953	Ubuntu 14.04 LTS / 16.04 LTS : Irssi vulnerabilities (USN-3184-1)	Nessus	Ubuntu Local Security Checks	low
96898	Fedora 24 : irssi (2017-d2e7217e2a)	Nessus	Fedora Local Security Checks	high
96893	Fedora 25 : irssi (2017-7f9e997585)	Nessus	Fedora Local Security Checks	high
96642	GLSA-201701-45 : irssi: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
96409	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : irssi (SSA:2017-011-03)	Nessus	Slackware Local Security Checks	high
96385	openSUSE Security Update : irssi (openSUSE-2017-67)	Nessus	SuSE Local Security Checks	high
96322	FreeBSD : Irssi -- multiple vulnerabilities (3d6be69b-d365-11e6-a071-001e67f15f5a)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2017-5196

high

Tenable Plugins

low

high

high

high

high

high

high