The buf.pl script before 2.20 in Irssi before 0.8.20 uses weak permissions for the scrollbuffer dump file created between upgrades, which might allow local users to obtain sensitive information from private chat conversations by reading the file.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - irssi: heap buffer overflow due to calculation error in the completion code (CVE-2018-5208)

  - The buf.pl script before 2.20 in Irssi before 0.8.20 uses weak permissions for the scrollbuffer dump file     created between upgrades, which might allow local users to obtain sensitive information from private chat     conversations by reading the file. (CVE-2016-7553)

  - An issue was discovered in Irssi before 1.0.4. When receiving messages with invalid time stamps, Irssi     would try to dereference a NULL pointer. (CVE-2017-10965)

  - An issue was discovered in Irssi before 1.0.4. While updating the internal nick list, Irssi could     incorrectly use the GHashTable interface and free the nick while updating it. This would then result in     use-after-free conditions on each access of the hash table. (CVE-2017-10966)

  - Irssi before 1.0.5, while waiting for the channel synchronisation, may incorrectly fail to remove     destroyed channels from the query list, resulting in use-after-free conditions when updating the state     later on. (CVE-2017-15227)

  - Irssi before 1.0.5, when installing themes with unterminated colour formatting sequences, may access data     beyond the end of the string. (CVE-2017-15228)

  - In Irssi before 1.0.5, certain incorrectly formatted DCC CTCP messages could cause a NULL pointer     dereference. This is a separate, but similar, issue relative to CVE-2017-9468. (CVE-2017-15721)

  - In certain cases, Irssi before 1.0.5 may fail to verify that a Safe channel ID is long enough, causing     reads beyond the end of the string. (CVE-2017-15722)

  - The nickcmp function in Irssi before 0.8.21 allows remote attackers to cause a denial of service (NULL     pointer dereference and crash) via a message without a nick. (CVE-2017-5193)

  - Use-after-free vulnerability in Irssi before 0.8.21 allows remote attackers to cause a denial of service     (crash) via an invalid nick message. (CVE-2017-5194)

  - Irssi before 0.8.21 allows remote attackers to cause a denial of service (out-of-bounds read and crash)     via a string containing a formatting sequence (%[) without a closing bracket (]). (CVE-2017-5356)

  - In Irssi before 1.0.3, when receiving a DCC message without source nick/host, it attempts to dereference a     NULL pointer. Thus, remote IRC servers can cause a crash. (CVE-2017-9468)

  - In Irssi before 1.0.3, when receiving certain incorrectly quoted DCC files, it tries to find the     terminating quote one byte before the allocated memory. Thus, remote attackers might be able to cause a     crash. (CVE-2017-9469)

  - When using incomplete escape codes, Irssi before 1.0.6 may access data beyond the end of the string.
    (CVE-2018-5205)

  - When the channel topic is set without specifying a sender, Irssi before 1.0.6 may dereference a NULL     pointer. (CVE-2018-5206)

  - When using an incomplete variable argument, Irssi before 1.0.6 may access data beyond the end of the     string. (CVE-2018-5207)

  - An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. A NULL pointer dereference occurs     for an empty nick. (CVE-2018-7050)

  - An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. Certain nick names could result in     out-of-bounds access when printing theme strings. (CVE-2018-7051)

  - An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. When the number of windows exceeds     the available space, a crash due to a NULL pointer dereference would occur. (CVE-2018-7052)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - irssi: heap buffer overflow due to calculation error in the completion code (CVE-2018-5208)

  - The buf.pl script before 2.20 in Irssi before 0.8.20 uses weak permissions for the scrollbuffer dump file     created between upgrades, which might allow local users to obtain sensitive information from private chat     conversations by reading the file. (CVE-2016-7553)

  - An issue was discovered in Irssi before 1.0.4. When receiving messages with invalid time stamps, Irssi     would try to dereference a NULL pointer. (CVE-2017-10965)

  - An issue was discovered in Irssi before 1.0.4. While updating the internal nick list, Irssi could     incorrectly use the GHashTable interface and free the nick while updating it. This would then result in     use-after-free conditions on each access of the hash table. (CVE-2017-10966)

  - Irssi before 1.0.5, while waiting for the channel synchronisation, may incorrectly fail to remove     destroyed channels from the query list, resulting in use-after-free conditions when updating the state     later on. (CVE-2017-15227)

  - Irssi before 1.0.5, when installing themes with unterminated colour formatting sequences, may access data     beyond the end of the string. (CVE-2017-15228)

  - In Irssi before 1.0.5, certain incorrectly formatted DCC CTCP messages could cause a NULL pointer     dereference. This is a separate, but similar, issue relative to CVE-2017-9468. (CVE-2017-15721)

  - In certain cases, Irssi before 1.0.5 may fail to verify that a Safe channel ID is long enough, causing     reads beyond the end of the string. (CVE-2017-15722)

  - The nickcmp function in Irssi before 0.8.21 allows remote attackers to cause a denial of service (NULL     pointer dereference and crash) via a message without a nick. (CVE-2017-5193)

  - Use-after-free vulnerability in Irssi before 0.8.21 allows remote attackers to cause a denial of service     (crash) via an invalid nick message. (CVE-2017-5194)

  - Irssi before 0.8.21 allows remote attackers to cause a denial of service (out-of-bounds read and crash)     via a string containing a formatting sequence (%[) without a closing bracket (]). (CVE-2017-5356)

  - In Irssi before 1.0.3, when receiving a DCC message without source nick/host, it attempts to dereference a     NULL pointer. Thus, remote IRC servers can cause a crash. (CVE-2017-9468)

  - In Irssi before 1.0.3, when receiving certain incorrectly quoted DCC files, it tries to find the     terminating quote one byte before the allocated memory. Thus, remote attackers might be able to cause a     crash. (CVE-2017-9469)

  - When using incomplete escape codes, Irssi before 1.0.6 may access data beyond the end of the string.
    (CVE-2018-5205)

  - When the channel topic is set without specifying a sender, Irssi before 1.0.6 may dereference a NULL     pointer. (CVE-2018-5206)

  - When using an incomplete variable argument, Irssi before 1.0.6 may access data beyond the end of the     string. (CVE-2018-5207)

  - An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. A NULL pointer dereference occurs     for an empty nick. (CVE-2018-7050)

  - An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. Certain nick names could result in     out-of-bounds access when printing theme strings. (CVE-2018-7051)

  - An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. When the number of windows exceeds     the available space, a crash due to a NULL pointer dereference would occur. (CVE-2018-7052)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

According to the version of the irssi package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - The buf.pl script before 2.20 in Irssi before 0.8.20     uses weak permissions for the scrollbuffer dump file     created between upgrades, which might allow local users     to obtain sensitive information from private chat     conversations by reading the file.(CVE-2016-7553)

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

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 Bock 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 Bock 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).

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

An information disclosure vulnerability was found in irssi.

CVE-2016-7553 Other users on the same machine as the user running irssi with buf.pl loaded may be able to retrieve the whole window contents after /UPGRADE. Furthermore, this dump of the windows contents is never removed afterwards.

For Debian 7 'Wheezy', this problems have been fixed in version 0.8.15-5+deb7u1.

We recommend that you upgrade your irssi packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Security fix for CVE-2016-7553.

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 IRC client irssi was updated to 0.8.20, fixing various bugs and security issues.

  - CVE-2016-7044: The unformat_24bit_color function in the     format parsing code in Irssi, when compiled with     true-color enabled, allowed remote attackers to cause a     denial of service (heap corruption and crash) via an     incomplete 24bit color code.

  - CVE-2016-7045: The format_send_to_gui function in the     format parsing code in Irssi allowed remote attackers to     cause a denial of service (heap corruption and crash)     via vectors involving the length of a string.

See https://irssi.org/security/irssi_sa_2016.txt for more details.

  - CVE-2016-7553: A information disclosure vulnerability in     irssi buf.pl

See https://irssi.org/2016/09/22/buf.pl-update/ for more information.

Security fix for CVE-2016-7553.

----

This is new version of irssi fixing security bugs, for details see upstream announcement:
https://github.com/irssi/irssi/releases/tag/0.8.20

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.

ID	Name	Product	Family	Severity
196853	RHEL 6 : irssi (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
196841	RHEL 7 : irssi (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
149111	EulerOS 2.0 SP3 : irssi (EulerOS-SA-2021-1803)	Nessus	Huawei Local Security Checks	low
146671	EulerOS 2.0 SP2 : irssi (EulerOS-SA-2021-1306)	Nessus	Huawei Local Security Checks	low
146140	EulerOS 2.0 SP5 : irssi (EulerOS-SA-2021-1197)	Nessus	Huawei Local Security Checks	low
96953	Ubuntu 14.04 LTS / 16.04 LTS : Irssi vulnerabilities (USN-3184-1)	Nessus	Ubuntu Local Security Checks	low
95358	Debian DLA-722-1 : irssi security update	Nessus	Debian Local Security Checks	low
94793	Fedora 25 : irssi (2016-39de4eb5e7)	Nessus	Fedora Local Security Checks	low
94093	openSUSE Security Update : irssi (openSUSE-2016-2524)	Nessus	SuSE Local Security Checks	high
93979	Fedora 24 : irssi (2016-a64716084e)	Nessus	Fedora Local Security Checks	high
93972	Fedora 23 : irssi (2016-0551065fe0)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2016-7553

low

Tenable Plugins

critical

critical

low

low

low

low

low

low

high

high

high