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Date: Mon, 23 Mar 2015 20:32:43 +0100
From: Florian Weimer <fw@...eb.enyo.de>
To: oss-security@...ts.openwall.com
Cc: Niko Tyni <ntyni@...ian.org>
Subject: CVE-2015-0841: off-by-one error in network code of monopd/libcapsinetwork
Niko Tyni privately reported this to us, but we don't think it is
exploitable with dlmalloc, so we skipped the embargo:
| There's an off-by-one error in libcapsinetwork network handling code,
| which was merged into monopd in version 0.9.4.
|
| From src/listener.cpp, Listener::checkActivity():
|
| #define MAXLINE 1024
| [...]
| char *readBuf = new char[MAXLINE];
| int n = read((*it)->fd(), readBuf, MAXLINE);
| if (n <= 0) // socket was closed
| {
| (*it)->setStatus(Socket::Closed);
| delete[] readBuf;
| return; // notification is (still) in earlier iteration
| }
| readBuf[n] = 0;
|
| With an input line longer than 1023, this will write zero at readBuf[1024]
| which is out of bounds.
<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=781043>
<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=781044>
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