The following advisory from securesoftware@list.cr.yp.to is for LinPopUp 1.2.0. I was not able to get net-im/linpopup-2.0.2 to SegFault or remove a file (as described in the advisory) using the given exploit, but inspecting the source shows the vulnerability still exists. PS: This is last one from securesoftware@list.cr.yp.to for now, the Q finally is empty. Yeah! :) Date: 15 Dec 2004 08:10:44 -0000 From: "D. J. Bernstein" <djb@cr.yp.to> Subject: [remote] [control] LinPopUp 1.2.0 overflows sub_string buffer To: securesoftware@list.cr.yp.to, jeanmarcj@usa.net X-HELOcheck: OK: FQDN Mailing-List: contact securesoftware-help@list.cr.yp.to; run by ezmlm Mail-Followup-To: securesoftware@list.cr.yp.to, jeanmarcj@usa.net Automatic-Legal-Notices: See http://cr.yp.to/mailcopyright.html. [-- Attachment #1 [details] --] [-- Type: text/plain, Encoding: 7bit, Size: 1.3K --] Stephen Dranger, a student in my Fall 2004 UNIX Security Holes course, has discovered a remotely exploitable security hole in LinPopUp, an instant-messaging tool. I'm publishing this notice, but all the discovery credits should be assigned to Dranger. You are at risk if you use LinPopUp to reply to a message received from the network or any other source that could be controlled by an attacker. Whoever sent that message then has complete control over your account: he can read and modify your files, watch the programs you're running, etc. Proof of concept: On an x86 computer running FreeBSD 4.10, as root, type cd /usr/ports/net/linpopup make install to download and compile the LinPopUp program, version 1.2.0 (current FreeBSD ports version). Then, as any user, save the file 3.msg attached to this message, and type cat 3.msg >> /var/db/linpopup/messages.dat to simulate receipt of 3.msg from the network. Then type LinPopUp and click on Reply. Unauthorized result: a file named x is removed from the current directory. Here's the bug: In string.c, strexpand() uses strcpy() to copy from replace_string, which can have as many as 100 bytes, to a 50-byte sub_string array. ---D. J. Bernstein, Associate Professor, Department of Mathematics, Statistics, and Computer Science, University of Illinois at Chicago
Created attachment 46179 [details] File 3.msg from advisory
mholzer since you have been dealing with the ebuild, can you verify/advise? Also 1.2.0 should maybe be considered for removal from the tree. ___ http://securitytracker.com/alerts/2004/Dec/1012542.html
====================================================== Candidate: CAN-2004-1282 URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1282 Reference: MISC:http://tigger.uic.edu/~jlongs2/holes/linpopup.txt Buffer overflow in the strexpand function in string.c for LinPopUp 1.2.0 allows remote attackers to execute arbitrary code via a crafted message that is not properly handled during a Reply operation. ======================================================
Created attachment 47207 [details, diff] string.c.diff Patch from http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=287044 This applies cleanly to our stable (2.0.2) version and probably others.
No metadata. mholzer/vapier : could you please apply patch (probably to all versions) and bump ?
i dont know why you thought i could help, i'm not in the ChangeLog :P ... i'm not your security lacky you know ! version bumped to 2.0.4 and removed the older ebuilds ... x86 was the only one to have a stable version, amd64/ppc were added with 2.0.3, but as unstable new 2.0.4 is marked x86 stable and amd64/ppc unstable
Thx vapier, you just signed yourself over to Security:P
vapier: 2.0.4 still needs patch applied. Could you please bump to -r1 ? (I really should take time to read that quiz)
added 2.0.4-r1 to cvs with patch
Thx, really ready now. Draft submitted, security please review
GLSA 200501-01
