OBS worker VM escape via relative symbolic links

published 2018-03-01 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14297

cvss: 5.0; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

The bs_worker code in open build service before 20170320 followed relative symlinks, allowing reading of files outside of the package source directory during build, allowing leakage of private information.

Patch / fix

fixed in 1 distros 1 links 1

openSUSE open build service 20170320

open-build-service Debian 12 2.7.4-3

debian advisories DEBIAN-CVE-2017-5188

github.com/openSUSE/open-build-service@ba27c91 commit

Exploit prediction

1.15% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	5.0	CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

openSUSE open build service

Classification

Weakness

CWE-59 Improper Link Resolution Before File Access
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

CVE List CVE-2017-5188
NVD CVE-2017-5188

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary