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Debian: Security update for radvd

Multiple security issues were discovered by Vasiliy Kulikov in radvd, an IPv6 Router Advertisement daemon. The set_interface_var() function doesn’t check the interface name, which is chosen by an unprivileged user. This could lead to an arbitrary file overwrite if the attacker has local access, or specific files overwrites otherwise. The process_ra() function lacks multiple buffer length checks which could lead to memory reads outside the stack, causing a crash of the daemon. The process_rs() function calls mdelay() unconditionnally when running in unicast-only mode. As this call is in the main thread, that means all request processing is delayed. An attacker could flood the daemon with router solicitations in order to fill the input queue, causing a temporary denial of service. Updated packages are available from security.debian.org.

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- -------------------------------------------------------------------------
Debian Security Advisory DSA-2323-1                   security@debian.org
http://www.debian.org/security/                         Yves-Alexis Perez
October 26, 2011                       http://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package        : radvd
Vulnerability  : several
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2011-3602 CVE-2011-3604 CVE-2011-3605
Debian Bug     : 644614

Multiple security issues were discovered by Vasiliy Kulikov in radvd, an 
IPv6 Router Advertisement daemon:

CVE-2011-3602

  set_interface_var() function doesn't check the interface name, which is
  chosen by an unprivileged user. This could lead to an arbitrary file
  overwrite if the attacker has local access, or specific files overwrites
  otherwise.

CVE-2011-3604

  process_ra() function lacks multiple buffer length checks which could
  lead to memory reads outside the stack, causing a crash of the daemon.

CVE-2011-3605

  process_rs() function calls mdelay() (a function to wait for a defined
  time) unconditionnally when running in unicast-only mode. As this call
  is in the main thread, that means all request processing is delayed (for
  a time up to MAX_RA_DELAY_TIME, 500 ms by default). An attacked could
  flood the daemon with router solicitations in order to fill the input
  queue, causing a temporary denial of service (processing would be
  stopped during all the mdelay() calls).
  Note: upstream and Debian default is to use anycast mode.


For the oldstable distribution (lenny), this problem has been fixed in
version 1:1.1-3.1.

For the stable distribution (squeeze), this problem has been fixed in
version 1:1.6-1.1.

For the testing distribution (wheezy), this problem has been fixed in
version 1:1.8-1.2.

For the unstable distribution (sid), this problem has been fixed in
version 1:1.8-1.2.

We recommend that you upgrade your radvd packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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