Improper input validation in icu (Alpine package)

1) Improper input validation

EUVDB-ID: #VU13052

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2014-8147

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to cause DoS condition or execute arbitrary code on the target system.

The vulnerability exists due to the resolveImplicitLevels function in common/ubidi.c in the Unicode Bidirectional Algorithm implementation in ICU4C uses an integer data type that is inconsistent with a header file. A remote unauthenticated attacker can supply specially crafted text file, trigger incorrect malloc followed by invalid free and cause the service to crash or execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

icu (Alpine package): 52.1-r0

CPE2.3

• cpe:2.3:o:alpine:icu_alpine_package:52.1-r0:*:*:*:*:alpine_linux:*:2.6

External links

https://git.alpinelinux.org/aports/commit/?id=cd87def91c8313b273996323459f047b80464c3f
https://git.alpinelinux.org/aports/commit/?id=3525b0ef592aad9d320f5834662190482def7d1b
https://git.alpinelinux.org/aports/commit/?id=ba0d9dbb245e1b1c8513f7c256ac31205db8f7ba

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.