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AUSCERT External Security Bulletin Redistribution
IRSSI-SA-2017-10 Irssi Security Advisory
23 October 2017
AusCERT Security Bulletin Summary
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
CVE Names: CVE-2017-15723 CVE-2017-15722 CVE-2017-15721
CVE-2017-15228 CVE-2017-15227 CVE-2017-9468
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IRSSI-SA-2017-10 Irssi Security Advisory 
CVE-2017-15228, CVE-2017-15227, CVE-2017-15721, CVE-2017-15723,
Multiple vulnerabilities have been located in Irssi.
(a) When installing themes with unterminated colour formatting
sequences, Irssi may access data beyond the end of the
string. (CWE-126) Found by Hanno BÃ¶ck.
CVE-2017-15228 was assigned to this issue.
(b) 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. Found by Joseph Bisch. (CWE-416 caused by CWE-672)
CVE-2017-15227 was assigned to this issue.
(c) Certain incorrectly formatted DCC CTCP messages could cause NULL
pointer dereference. Found by Joseph Bisch. This is a separate,
but similar issue to CVE-2017-9468. (CWE-690)
CVE-2017-15721 was assigned to this issue.
(d) Overlong nicks or targets may result in a NULL pointer dereference
while splitting the message. Found by Joseph Bisch. (CWE-690)
CVE-2017-15723 was assigned to this issue.
(e) In certain cases Irssi may fail to verify that a Safe channel ID
is long enough, causing reads beyond the end of the string. Found
by Joseph Bisch. (CWE-126)
CVE-2017-15722 was assigned to this issue.
(a,b,c,d) May result in denial of service (remote crash).
(e) May affect the stability of Irssi.
(a,b,c,e) All Irssi versions that we observed.
(d) Starting from 0.8.17.
Upgrade to Irssi 1.0.5. Irssi 1.0.5 is a maintenance release in the
1.0 series, without any new features.
After installing the updated packages, one can issue the /upgrade
command to load the new binary. TLS connections will require
(a) requires user to install malicious or broken theme file
(b,c,e) requires a broken ircd or control over the ircd
(d) irc servers typically have length limits in place
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