Denial of service in openssl (Alpine package)

1) Denial of service

EUVDB-ID: #VU815

Risk: Low

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:Clear]

CVE-ID: CVE-2016-6303

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated user to cause DoS conditions on the vulnerable system.
The weakness is caused by integer overflow in the MDC2_Update() function in 'crypto/mdc2/mdc2dgst.c'. By using large ammounts of input data attackers are able to trigger error in input length validation that leads to  crash of the affected service.
Successful exploitation of the vulnerability will result in denial of service on the vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

openssl (Alpine package): 1.0.1t-r1

CPE2.3

• cpe:2.3:a:alpine:openssl_alpine_package:1.0.1t-r1:*:*:*:*:alpine_linux:*:3.1

External links

https://git.alpinelinux.org/aports/commit/?id=3a3ffbd8e2b0a4b3e1b8fcf62f913a691bb4dae4
https://git.alpinelinux.org/aports/commit/?id=a879e6eaf315a19b45fd424f12f9bf072b168946
https://git.alpinelinux.org/aports/commit/?id=346532027d2b8b8d5cac13a2b7d86820dfaf34b7
https://git.alpinelinux.org/aports/commit/?id=6ea715958d6486933e7cc3ca163e3d0691c9629d
https://git.alpinelinux.org/aports/commit/?id=70b8770d37d514044077c7258c0e6e81aeeee5fe

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.