PT-2004-2354 · Simon Tatham · Putty

Published 2004-12-31 · Updated 2017-07-11 · CVE-2004-1440

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions: PuTTY versions prior to 0.55

Description: The issue is related to multiple heap-based buffer overflows in the modpow function. This allows remote attackers to execute arbitrary code via an SSH2 packet with a base argument that is larger than the mod argument, causing the modpow function to write memory before the beginning of its buffer. Additionally, remote malicious servers can cause a denial of service (client crash) and possibly execute arbitrary code via a large bignum during authentication.

Recommendations: For versions prior to 0.55, update to version 0.55 or later to resolve the issue. As a temporary workaround, consider restricting access to SSH2 packets with large base arguments to minimize the risk of exploitation.

Fix

Related Identifiers

CVE-2004-1440

Affected Products

Putty

References · 12

• https://osv.dev/vulnerability/CVE-2004-1440 · Vendor Advisory
• http://securityfocus.com/bid/10850 · Patch
• http://secunia.com/advisories/12212 · Patch
• https://security-tracker.debian.org/tracker/CVE-2004-1440 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2004-1440 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2004-1440 · Vendor Advisory
• http://chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modpow.html · Note
• http://gentoo.org/security/en/glsa/glsa-200408-04.xml · Patch, Vendor Advisory
• http://chiark.greenend.org.uk/~sgtatham/putty/changes.html · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1440 · Note
• https://exchange.xforce.ibmcloud.com/vulnerabilities/16885 · Note
• http://marc.info/?l=bugtraq&m=109167869528138&w=2 · Note