[Secure-testing-team] Bug#779397: xterm: buffer overflow with -S option

[Vincent Lefevre]

Package: xterm
Version: 312-1
Severity: important
Tags: security

$ xterm -S/dev/pts/20
*** buffer overflow detected ***: /usr/bin/xterm terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x731ff)[0x7f4de0b1b1ff]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7f4de0b9e4c7]
/lib/x86_64-linux-gnu/libc.so.6(+0xf46e0)[0x7f4de0b9c6e0]
/lib/x86_64-linux-gnu/libc.so.6(__stpncpy_chk+0x0)[0x7f4de0b9bb40]
/usr/bin/xterm[0x408eb0]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7f4de0ac9b45]
/usr/bin/xterm[0x408f9c]
======= Memory map: ========
[...]

Not sure whether this is a security issue, but a buffer overflow
looks really wrong...

-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages xterm depends on:
ii  libc6           2.19-15
ii  libfontconfig1  2.11.0-6.3
ii  libice6         2:1.0.9-1+b1
ii  libtinfo5       5.9+20140913-1+b1
ii  libutempter0    1.1.5-4
ii  libx11-6        2:1.6.2-3
ii  libxaw7         2:1.0.12-2+b1
ii  libxft2         2.3.2-1
ii  libxmu6         2:1.1.2-1
ii  libxpm4         1:3.5.11-1+b1
ii  libxt6          1:1.1.4-1+b1
ii  xbitmaps        1.1.1-2

Versions of packages xterm recommends:
ii  x11-utils  7.7+2

Versions of packages xterm suggests:
pn  xfonts-cyrillic  <none>

-- no debconf information