PT-2019-5476 · Simon Tatham+1 · Putty+1

Published 2019-03-21 · Updated 2019-05-07 · CVE-2019-9894

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions PuTTY versions prior to 0.71

Description A remotely triggerable memory overwrite issue exists in the RSA key exchange of PuTTY. This issue can be exploited before host key verification, potentially allowing a remote attacker to overwrite files in the system. The vulnerability is related to errors in key management.

Recommendations For versions prior to 0.71, update to version 0.71 or later to resolve the issue. As a temporary workaround, consider restricting access to the RSA key exchange functionality until a patch is applied. Avoid using the vulnerable RSA key exchange in PuTTY until the issue is resolved.

Fix

Weakness Enumeration

CWE-320

Related Identifiers

BDU:2020-03215

CVE-2019-9894

DLA-1763-1

DSA-4423-1

MGASA-2019-0153

OPENSUSE-SU-2019:1113-1

OPENSUSE-SU-2019:1123-1

OPENSUSE-SU-2019_1113-1

Affected Products

Putty

Suse

References · 39

• https://osv.dev/vulnerability/openSUSE-SU-2019:1113-1 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4423-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/LDO3F267P347E6U2IILFCYW7JPTLCCES · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2019-0153 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2019:1123-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-9894 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/TBPZ6RAMBOJAKKPJ54MPIPJTXNB2T6FW · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-9894 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-9894 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-9894 · Vendor Advisory
• https://debian.org/security/2019/dsa-4423 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-9894 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2019-0153.html · Security Note