Permissions, Privileges, and Access Controls in apache-ant (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU47428

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-11979

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to incorrect patch for vulnerability #VU27924 (CVE-2020-1945). Apache Ant 1.10.8 changed the permissions of temporary files it created so that only the current user was allowed to access them. Unfortunately the fixcrlf task deleted the temporary file and created a new one without said protection, effectively nullifying the effort. This would still allow an attacker to inject modified source files into the build process.

Mitigation

Install update from vendor's website.

Vulnerable software versions

apache-ant (Alpine package): 1.9.7-r0 - 1.10.9-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=d0beafdbb5ebed0173974d00db4f6e12c30ba30a

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.