Vulnerabilities > CVE-2008-4762 - Buffer Errors vulnerability in Freesshd 1.2.1

047910
CVSS 9.0 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
SINGLE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
network
low complexity
freesshd
CWE-119
critical
exploit available

Summary

Stack-based buffer overflow in freeSSHd 1.2.1 allows remote authenticated users to cause a denial of service (service crash) and potentially execute arbitrary code via a long argument to the (1) rename and (2) realpath parameters.

Vulnerable Configurations

Part Description Count
Application
Freesshd
1

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Exploit-Db

  • descriptionfreeSSHd 1.2.1 sftp realpath Remote Buffer Overflow PoC (auth). CVE-2008-4762. Dos exploit for windows platform
    fileexploits/windows/dos/6812.pl
    idEDB-ID:6812
    last seen2016-02-01
    modified2008-10-22
    platformwindows
    port
    published2008-10-22
    reporterJeremy Brown
    sourcehttps://www.exploit-db.com/download/6812/
    titlefreeSSHd 1.2.1 sftp realpath Remote Buffer Overflow PoC auth
    typedos
  • descriptionfreeSSHd 1.2.1 sftp rename Remote Buffer Overflow PoC (auth). CVE-2008-4762. Dos exploit for windows platform
    fileexploits/windows/dos/6800.pl
    idEDB-ID:6800
    last seen2016-02-01
    modified2008-10-22
    platformwindows
    port
    published2008-10-22
    reporterJeremy Brown
    sourcehttps://www.exploit-db.com/download/6800/
    titlefreeSSHd 1.2.1 sftp rename Remote Buffer Overflow PoC auth
    typedos