CVE-2017-15227

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.

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.

While waiting for the channel synchronization, Irssi 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).

When installing themes with unterminated color formatting sequences, Irssi may access data beyond the end of the string. (CVE-2017-15228).

Certain incorrectly formatted DCC CTCP messages could cause NULL pointer dereference (CVE-2017-15721).

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

Overlong nicks or targets may result in a NULL pointer dereference while splitting the message (CVE-2017-15723).

This security update for irssi to version 1.0.5 addresses the following security issues:

• CVE-2017-15228: When installing themes with unterminated colour formatting sequences, Irssi may access data beyond the end of the string. This issue could have resulted in denial of service (remote crash) when installing a malicious or broken theme file.
• CVE-2017-15227: While waiting for the channel synchronisation, Irssi may incorrectly fail to remove destroyed channels from the query list, resulting in use after free conditions when updating the state later on. This issue could have caused denial of service (remote crash) when connecting to a malicious or broken ircd.
• CVE-2017-15721: Certain incorrectly formatted DCC CTCP messages could cause NULL pointer dereference. This issue could have caused denial of service (remote crash) when connecting to a malicious or broken ircd.
• CVE-2017-15723: Overlong nicks or targets may result in a NULL pointer dereference while splitting the message. This issue could have caused denial of service (remote crash) when connecting to a malicious or broken ircd.
• CVE-2017-15722: In certain cases Irssi may fail to verify that a Safe channel ID is long enough, causing reads beyond the end of the string.

This security update for irssi to version 1.0.5 addresses the following security issues:

• CVE-2017-15228: When installing themes with unterminated colour formatting sequences, Irssi may access data beyond the end of the string. This issue could have resulted in denial of service (remote crash) when installing a malicious or broken theme file.
• CVE-2017-15227: While waiting for the channel synchronisation, Irssi may incorrectly fail to remove destroyed channels from the query list, resulting in use after free conditions when updating the state later on. This issue could have caused denial of service (remote crash) when connecting to a malicious or broken ircd.
• CVE-2017-15721: Certain incorrectly formatted DCC CTCP messages could cause NULL pointer dereference. This issue could have caused denial of service (remote crash) when connecting to a malicious or broken ircd.
• CVE-2017-15723: Overlong nicks or targets may result in a NULL pointer dereference while splitting the message. This issue could have caused denial of service (remote crash) when connecting to a malicious or broken ircd.
• CVE-2017-15722: In certain cases Irssi may fail to verify that a Safe channel ID is long enough, causing reads beyond the end of the string.

These are all security issues fixed in the irssi-1.2.3-2.4 package on the GA media of openSUSE Tumbleweed.

Brian Carpenter discovered that Irssi incorrectly handled messages with invalid time stamps. A malicious IRC server could use this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-10965)

Brian Carpenter discovered that Irssi incorrectly handled the internal nick list. A malicious IRC server could use this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-10966)

Joseph Bisch discovered that Irssi incorrectly removed destroyed channels from the query list. A malicious IRC server could use this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-15227)

Hanno Böck discovered that Irssi incorrectly handled themes. If a user were tricked into using a malicious theme, a attacker could use this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-15228)

Joseph Bisch discovered that Irssi incorrectly handled certain DCC CTCP messages. A malicious IRC server could use this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-15721)

Joseph Bisch discovered that Irssi incorrectly handled certain channel IDs. A malicious IRC server could use this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-15722)

Joseph Bisch discovered that Irssi incorrectly handled certain long nicks or targets. A malicious IRC server could use this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-15723)