Buffer overflow in PuTTY

1) Buffer overflow

EUVDB-ID: #VU32029

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-9895

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PuTTY: 0.45 - 0.70

CPE2.3

• cpe:2.3:a:simon_tatham:putty:0.45:*:*:*:*:*:*:*
• cpe:2.3:a:simon_tatham:putty:0.46:*:*:*:*:*:*:*
• cpe:2.3:a:simon_tatham:putty:0.47:*:*:*:*:*:*:*

External links

https://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html
https://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW7JPTLCCES/
https://seclists.org/bugtraq/2019/Apr/6
https://security.netapp.com/advisory/ntap-20190404-0001/
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
https://www.debian.org/security/2019/dsa-4423

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.