Buffer overflow in putty (Alpine package)

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 (Alpine package): 0.60-r0 - 0.70-r1

CPE2.3

• cpe:2.3:a:alpine:putty_alpine_package:0.60-r0:*:*:*:*:alpine_linux:*:2.2
• cpe:2.3:a:alpine:putty_alpine_package:0.61-r0:*:*:*:*:alpine_linux:*:2.3
• cpe:2.3:a:alpine:putty_alpine_package:0.62-r0:*:*:*:*:alpine_linux:*:2.4

External links

https://git.alpinelinux.org/aports/commit/?id=8d7092356e7b101ff1c39be6009da6297e5aa418
https://git.alpinelinux.org/aports/commit/?id=5ff69c33184958f7cc0a18b0a80c819d82e9a49e
https://git.alpinelinux.org/aports/commit/?id=8d25ad814b36930f39f2c7d760a90f54c3350720
https://git.alpinelinux.org/aports/commit/?id=e29c5d734c6d64bd6709f1e9a9e3404ca37f2211
https://git.alpinelinux.org/aports/commit/?id=e68f4defc683245fe34f4caa1ad6b6c64e5e6c23

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.