PT-2019-4109 · Openbsd · Doas

Duncaen · Published 2019-09-03 · Updated 2020-08-24 · CVE-2019-15901

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions doas versions prior to 6.2

Description The issue is related to insufficient input validation in the setusercontext() function of the doas utility. This could allow a remote attacker to impact the integrity, confidentiality, and availability of protected information. The problem arises from a setusercontext(3) call being replaced with a single setuid(2) call on certain platforms, such as Linux and possibly NetBSD, which fails to change the group id or initialize secondary group ids.

Recommendations For doas versions prior to 6.2, update to version 6.2 or later to resolve the issue. As a temporary workaround, consider restricting the use of the setusercontext() function until a patch is available.

Exploit

Fix

RCE

Improper Privilege Management

Weakness Enumeration

CWE-20

CWE-269

Related Identifiers

BDU:2019-04679

CVE-2019-15901

Affected Products

Doas

References · 7

• 🔥 https://github.com/slicer69/doas/pull/23 · Exploit
• https://github.com/slicer69/doas/compare/6.1p1...6.2 · Patch
• https://github.com/slicer69/doas/commit/6cf0236184ff6304bf5e267ccf7ef02874069697 · Patch
• https://bdu.fstec.ru/vul/2019-04679 · Security Note
• https://osv.dev/vulnerability/CVE-2019-15901 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-15901 · Security Note
• https://us-cert.gov/ncas/bulletins/SB19301 · Note