Link following in conky (Alpine package)

1) Link following

EUVDB-ID: #VU33127

Risk: Low

CVSSv4.0: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2011-3616

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

The vulnerability allows a local non-authenticated attacker to #BASIC_IMPACT#.

The getSkillname function in the eve module in Conky 1.8.1 and earlier allows local users to overwrite arbitrary files via a symlink attack on /tmp/.cesf.

Mitigation

Install update from vendor's website.

Vulnerable software versions

conky (Alpine package): 1.8.1-r0 - 1.8.1-r1

wget (Alpine package): 1.12-r0 - 1.12-r3

CPE2.3

• cpe:2.3:o:alpine:conky_alpine_package:1.8.1-r0:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:conky_alpine_package:1.8.1-r1:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:wget_alpine_package:1.12-r0:*:*:*:*:alpine_linux:*:1.9
• cpe:2.3:o:alpine:wget_alpine_package:1.12-r2:*:*:*:*:alpine_linux:*:2.0
• cpe:2.3:o:alpine:wget_alpine_package:1.12-r3:*:*:*:*:alpine_linux:*:2.1

External links

https://git.alpinelinux.org/aports/commit/?id=159f49addbd7a02f712bc7ea1018feccb123ffc1
https://git.alpinelinux.org/aports/commit/?id=88e633357b740fd805059e7902277ef67ec39ebc

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.