var-200601-0173
Vulnerability from variot

The Cisco IP Phone 7940 allows remote attackers to cause a denial of service (reboot) via a large amount of TCP SYN packets (syn flood) to arbitrary ports, as demonstrated to port 80. Cisco IP Phone 7940 is prone to a remote denial of service vulnerability. Successful exploitation causes the phone to restart. Cisco is tracking this issue as Cisco bug ID CSCef33398. Solaris is a commercial UNIX operating system developed and maintained by Sun. There is a buffer overflow vulnerability in the /usr/bin/uustat binary program of Solaris. An attacker who successfully exploits this vulnerability can completely control the return address of the execution function and execute arbitrary code with uucp user privileges. If the string length after the \"-S\" command line parameter is greater than or equal to 1152 bytes, it may cause the binary program to crash. The following example shows that the buffer is overflowed and the o1 register is completely overwritten by the letter A: bash-2.03\% ls -l /usr/bin/uustat ---s--x--x 1 uucp uucp 62012 Jan 17 16:07 uustat bash-2.03$ /usr/bin/uustat -S perl -e \'\'print \"A\"x3000\'\' Segmentation Fault bash-2.03$ (gdb) info registers g0 0x0 0 g1 0xff315e98 - 13541736 g2 0x1cc00 117760 g3 0x440 1088 g4 0x0 0 g5 0x0 0 g6 0x0 0 g7 0x0 0 o0 0xff3276a8 -13470040 o1 0x41414141 1094795585 ...

The vulnerability is caused due to an error in the IP Stack.

SOLUTION: Update to firmware revision 7.1(1) or later, which have the capability to perform load control using TCP throttling. This prevents a device from reloading.

PROVIDED AND/OR DISCOVERED BY: The vendor credits Knud Erik H\xf8jgaard.

ORIGINAL ADVISORY: http://www.cisco.com/warp/public/707/cisco-response-20060113-ip-phones.shtml

About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.

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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.