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Family: Gentoo Local Security Checks --> Category: infos

[GLSA-200410-29] PuTTY: Pre-authentication buffer overflow Vulnerability Scan

Vulnerability Scan Summary
PuTTY: Pre-authentication buffer overflow

Detailed Explanation for this Vulnerability Test
The remote host is affected by the vulnerability described in GLSA-200410-29
(PuTTY: Pre-authentication buffer overflow)

PuTTY fails to do proper bounds checking on SSH2_MSG_DEBUG packets. The
"stringlen" parameter value is incorrectly checked due to signedness
issues. Note that this vulnerability is similar to the one described in
GLSA 200408-04 but not the same.


When PuTTY connects to a server using the SSH2 protocol, a possible hacker may be
able to send specially crafted packets to the client, resulting in the
execution of arbitrary code with the permissions of the user running PuTTY.
Note that this is possible during the authentication process but before
host key verification.


There is no known workaround at this time.


All PuTTY users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/putty-0.56"

Threat Level: Medium

Click HERE for more information and discussions on this network vulnerability scan.


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