Improper input validation in prayer (Alpine package)

1) Improper input validation

EUVDB-ID: #VU8447

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-0898

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition or obtain potentially sensitive information on the target system.

The weakness exists due to buffer underrun in the Kernel.sprintf() method. A remote attacker can provide a specially crafted format string value to cause the target interpreter to crash or potentially access data from the heap.

Successful exploitation of the vulnerability results in information disclosure or denial of service.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ruby (Alpine package): 2.5.0-r0 - 2.7.1-r5

prayer (Alpine package): 1.3.5-r5

ruby (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:ruby_alpine_package:2.5.0-r0:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:o:alpine:ruby_alpine_package:2.5.0-r1:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:o:alpine:ruby_alpine_package:2.5.1-r0:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:o:alpine:prayer_alpine_package:1.3.5-r5:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:o:alpine:ruby_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=00e11164a40032afe167743eee57220f912bbc06

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.