PuTTY "sftp_pkt_getstring" function buffer overflow

putty-sftppktgetstring-bo (19403) The risk level is classified as HighHigh Risk

Description:

PuTTY is vulnerable to an integer buffer overflow in the 'sftp_pkt_getstring' function in the 'sftp.c'. By sending a specially-crafted sftp string, a remote attacker could overflow a buffer and execute arbitrary code on the system.

Note: The host key must be verified in order to exploit this vulnerability.


Consequences:

Gain Access

Remedy:

Upgrade to the latest version of PuTTY (0.57 or later), available from the PuTTY Download Web page. See References.

For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 2005-02-28 for patch, upgrade, or suggested workaround information. See References.

References:

  • PuTTY Download Web page: PuTTY Download Page.
  • PuTTY vulnerability: PuTTY vulnerability vuln-sftp-string.
  • BID-12601: PuTTY/PSFTP/PSCP Multiple Remote Integer Overflow Vulnerabilities
  • CVE-2005-0467: Multiple integer overflows in the (1) sftp_pkt_getstring and (2) fxp_readdir_recv functions in the PSFTP and PSCP clients for PuTTY 0.56, and possibly earlier versions, allow remote malicious web sites to execute arbitrary code via SFTP responses that corrupt the heap after insufficient memory has been allocated.
  • GLSA-200502-28: PuTTY: Remote code execution
  • SA14333: PuTTY Two Integer Overflow Vulnerabilities
  • SA17214: IBM TotalStorage SAN Volume Controller PuTTY Vulnerability

Platforms Affected:

  • Gentoo Linux
  • PuTTY PuTTY prior to 0.57

Reported:

Feb 21, 2005

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