Information disclosure in prayer (Alpine package)

1) Information disclosure

EUVDB-ID: #VU8123

Risk: Low

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

CVE-ID: CVE-2017-14064

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

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

The weakness exists due to an issue with using strdup in ext/json/ext/generator/generator.c during a JSON generate call. A remote attacker can send a specially crafted request, stop strdup after encountering a '' byte, returning a pointer to a string of length zero, which is not the length stored in space_len and expose arbitrary memory.

Successful exploitation of the vulnerability results in information disclosure.

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.