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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2668 IRSSI-SA-2017-10 Irssi Security Advisory 23 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Irssi Publisher: Irssi 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 Resolution: Patch/Upgrade CVE Names: CVE-2017-15723 CVE-2017-15722 CVE-2017-15721 CVE-2017-15228 CVE-2017-15227 CVE-2017-9468 Reference: ESB-2017.1517 ESB-2017.1469 ESB-2017.1441 - --------------------------BEGIN INCLUDED TEXT-------------------- IRSSI-SA-2017-10 Irssi Security Advisory [1] ============================================ CVE-2017-15228, CVE-2017-15227, CVE-2017-15721, CVE-2017-15723, CVE-2017-15722 Description - ----------- 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 Böck. 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. Impact - ------ (a,b,c,d) May result in denial of service (remote crash). (e) May affect the stability of Irssi. Affected versions - ----------------- (a,b,c,e) All Irssi versions that we observed. (d) Starting from 0.8.17. Fixed in - -------- Irssi 1.0.5 Recommended action - ------------------ 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 /reconnect. Mitigating facts - ---------------- (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 Patch - ----- https://github.com/irssi/irssi/commit/43e44d553d44e313003cee87e6ea5e24d68b84a1 References - ---------- [1] https://irssi.org/security/irssi_sa_2017_10.txt - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWe1d84x+lLeg9Ub1AQiHyQ//cIbFHt0qUSr/4RYu4qX4spX6eq9CUIsc nU/2hDFjXQakgM7k3a6lKFxKyULXTYsJNNzDuRcxYFvvg4vcfXebwS/V9L29cEit cu9aJ7RTedGPy17r4sd0fPF5XFiU+ju/I6ac+1Tvq468C/gFKmPgpgKU7zHWFbvz IIKhAZdFtRbnD/krMV8OeRoBFv2f9PpCyTMlOmCDkWr9GOytwFoqwpoZWrAKEm4S yYkUHpXEd+fpDTBfuYWdSZaOE/AA2GXpZPXSCytFAlT5evn/PBLLuWtGwGvDIN5B SjqgpAK5Yyak5On1ntPuc9IES/0IOkoRjseMoEYtgWeApE0Wh70UAAS5PeyL2NM8 9rXd0A0BCEDMKxdc1Nnch+IpBtZ+DHaJy+m+w89ezR7VptLPvQYR55z3LZt/PvvB hHDmihUUw75rAebgYeD43FrMYdWaV685jqqMnsSBEDXIsqwTatNKpQIIpIljautE CJTT6oavPMILy9Xj/grzY7TAPMq0ej93s567k1vrhYKAFwnH5qphXbFw7a/MWOvo Cbfh5XPITv/MpBwTq/FD5Ma26umWz1SATzq4bG1vGGEbnyLl+pDvjgdKSqQLubbA RWf5TkvOqeCAfZ3lgfWIyZrLaTtXVR3KFub16RijzbkLmG6iV6kNwaTeUpU4zcbp Pa8M0R5j5ZA= =xqgv -----END PGP SIGNATURE-----