PuTTY/PSFTP/PSCP Multiple Remote Integer Overflow Vulnerabilities

BID:12601

Info

PuTTY/PSFTP/PSCP Multiple Remote Integer Overflow Vulnerabilities

Bugtraq ID: 12601
Class: Boundary Condition Error
CVE:
Remote: Yes
Local: No
Published: Feb 21 2005 12:00AM
Updated: Feb 21 2005 12:00AM
Credit: Gael Delalleau is credited with discovery.
Vulnerable: Simon Tatham PuTTY 0.56
Simon Tatham PuTTY 0.55
Simon Tatham PuTTY 0.54
Simon Tatham PuTTY 0.53 b
Simon Tatham PuTTY 0.53
Simon Tatham PuTTY 0.52
Simon Tatham PuTTY 0.51
Simon Tatham PuTTY 0.50
Simon Tatham PuTTY 0.49
- Microsoft Windows 2000 Professional
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows NT 4.0
 Simon Tatham PuTTY 0.48
- Microsoft Windows 2000 Professional
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows NT 4.0
 Simon Tatham PSFTP 0.55
Simon Tatham PSCP 0.55
Simon Tatham PSCP 0.54
Gentoo Linux
Not Vulnerable: Simon Tatham PuTTY 0.57
Simon Tatham PSFTP 0.57
Simon Tatham PSCP 0.57

Discussion

PuTTY/PSFTP/PSCP Multiple Remote Integer Overflow Vulnerabilities

PuTTY, PSFTP and PSCP are reported prone to multiple integer overflow vulnerabilities. The following individual issues are reported:

The first reported vulnerability, an integer overflow, exists in the 'fxp_readdir_recv()' function of the 'sftp.c' source file.

A remote malicious server may trigger this vulnerability in order to execute arbitrary code in the context of the user that is running the affected client. It should be noted that this vulnerability exists in a code path that is executed after host key verification occurs, this may hinder exploitation.

The second issue, another integer overflow, is reported to exist in the 'sftp_pkt_getstring()' of the 'sftp.c' source file.

A remote malicious server may trigger this vulnerability in order to crash the affected client or to potentially execute arbitrary code. It should be noted that this vulnerability exists in a code path that is executed after host key verification occurs, this may also hinder exploitation.

These vulnerabilities are reported to exist in versions of PSFTP and PSCP prior to version 0.57.

Exploit / POC

PuTTY/PSFTP/PSCP Multiple Remote Integer Overflow Vulnerabilities

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

PuTTY/PSFTP/PSCP Multiple Remote Integer Overflow Vulnerabilities

Solution:
The vendor has released version 0.57 of the affected software to address these vulnerabilities.

Gentoo has released an advisory (GLSA 200502-28) and an updated eBuild to address these vulnerabilities. Gentoo users can apply this update by issuing the following sequence of commands as a superuser:
emerge --sync
emerge --ask --oneshot --verbose ">=net-misc/putty-0.57"


Simon Tatham PuTTY 0.48

Simon Tatham PuTTY 0.49

Simon Tatham PuTTY 0.50

Simon Tatham PuTTY 0.51

Simon Tatham PuTTY 0.52

Simon Tatham PuTTY 0.53

Simon Tatham PuTTY 0.53 b

Simon Tatham PSCP 0.54

Simon Tatham PuTTY 0.54

Simon Tatham PSFTP 0.55

Simon Tatham PSCP 0.55

Simon Tatham PuTTY 0.55

Simon Tatham PuTTY 0.56

References

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