Input validation error in dovecot (Alpine package)
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2019-10691 |
| CWE-ID | CWE-20 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
dovecot (Alpine package) Operating systems & Components / Operating system package or component |
| Vendor | Alpine Linux Development Team |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Input validation error
EUVDB-ID: #VU18307
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-10691
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to improper input validation of user-supplied characters in UTF-8 encoding within the JSON encoder. A remote unauthenticated attacker can supply a specially crafted string that contains invalid UTF-8 characters via a username during authentication process or via “From” or “Subject” headers in an email (if OX push notification driver is enabled) and crash the affected server.
Successful exploitation of the vulnerability will result in denial of service (DoS) attack.
Mitigation
Install update from vendor's website.
Vulnerable software versionsdovecot (Alpine package): 2.3.2.1-r0 - 2.3.5.1-r1
External linkshttp://git.alpinelinux.org/aports/commit/?id=4cbff22201d9f2fb21d860bae0e62f3bf814ed45
http://git.alpinelinux.org/aports/commit/?id=7f9b5fbadaf37d0e9b4a716239593edb14d4db6b
http://git.alpinelinux.org/aports/commit/?id=f82ad4a4bd0bcfe6c75ff43189ad29dc14c38add
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.
