Use-after-free in dovecot (Alpine package)

1) Use-after-free

EUVDB-ID: #VU27983

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-10958

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error when processing newline characters. A remote attacker can a specially crafted command to submission, submission-login or lmtp service and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

dovecot (Alpine package): 2.3.2.1-r0 - 2.3.10-r0

CPE2.3

• cpe:2.3:a:alpine:dovecot_alpine_package:2.3.2.1-r0:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:a:alpine:dovecot_alpine_package:2.3.4.1-r0:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:a:alpine:dovecot_alpine_package:2.3.4.1-r1:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=4188e3f4c8c70ca30f481278b85d52799ade266a
https://git.alpinelinux.org/aports/commit/?id=63c2cc277e73718a89df156cafffdaaf5bbad6cc
https://git.alpinelinux.org/aports/commit/?id=e9ada9531d3f3e60456ec07437a2f39f9a196861
https://git.alpinelinux.org/aports/commit/?id=25fe34656b9e14d6e4e67944f178c6687c95c901
https://git.alpinelinux.org/aports/commit/?id=2b1449bb52bbd408ea452e0f29312761f669c517

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.