Incorrect default permissions in apache-ant (Alpine package)

1) Incorrect default permissions

EUVDB-ID: #VU27924

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-1945

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to Apache Ant is using a default temporary directory identified by the Java system property java.io.tmpdir for several tasks and may thus leak sensitive information. The fixcrlf and replaceregexp tasks also copy files from the temporary directory back into the build tree allowing an attacker to inject modified source files into the build process. A local user with access to the system can view contents of files and directories or modify them.

Mitigation

Install update from vendor's website.

Vulnerable software versions

apache-ant (Alpine package): 1.9.7-r0 - 1.10.7-r0

CPE2.3

• cpe:2.3:o:alpine:apache-ant_alpine_package:1.9.7-r0:*:*:*:*:alpine_linux:*:3.4
• cpe:2.3:o:alpine:apache-ant_alpine_package:1.10.1-r0:*:*:*:*:alpine_linux:*:3.6
• cpe:2.3:o:alpine:apache-ant_alpine_package:1.10.2-r0:*:*:*:*:alpine_linux:*:3.7

External links

https://git.alpinelinux.org/aports/commit/?id=3c8436ba9ba604efe7fe2c18a936817c9a48d7ac
https://git.alpinelinux.org/aports/commit/?id=c902b4f58f0146fedbe0e40a24e0b1384ee70220

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.