PT-2017-1179 · Linux+5 · Linux Kernel+5

Published 2017-01-10 · Updated 2019-10-03 · CVE-2017-5551

Positive Technologies (AI Summary)

CVSS v3.1

4.4

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.9.6

Description The issue is related to the simple set acl function in the Linux kernel, which has inadequate access control. This can be exploited by a local attacker to elevate privileges during the execution of the setxattr call. The problem arises because the setgid bit is preserved during a setxattr call involving a tmpfs filesystem, allowing local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions.

Recommendations For Linux kernel versions prior to 4.9.6, update to version 4.9.6 or later to resolve the issue. As a temporary workaround, consider restricting access to setgid programs to minimize the risk of exploitation.

Fix

Weakness Enumeration

CWE-264

Related Identifiers

ALT-PU-2017-1088

ALT-PU-2017-1330

BDU:2017-00290

CESA-2017_0817

CESA-2017_1842

CVE-2017-5551

DSA-3791-1

MGASA-2017-0063

MGASA-2017-0064

MGASA-2017-0065

OPENSUSE-SU-2017_0456-1

OPENSUSE-SU-2017_0458-1

RHSA-2017:0817

RHSA-2017:1842

RHSA-2017:2077

RHSA-2017:2669

RHSA-2017_0817

RHSA-2017_1842

RHSA-2017_2077

SUSE-SU-2017:0333-1

SUSE-SU-2017:0407-1

SUSE-SU-2017:0437-1

SUSE-SU-2017:0464-1

SUSE-SU-2017:0471-1

SUSE-SU-2017:0494-1

SUSE-SU-2017:0575-1

SUSE-SU-2017:1102-1

SUSE-SU-2017:1990-1

USN-3234-1

USN-3234-2

USN-3359-1

USN-3361-1

Affected Products

Alt Linux

Centos

Linux Kernel

Red Hat

Suse

Ubuntu

References · 833

• https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f31 · Patch
• http://debian.org/security/2017/dsa-3791 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2017-5551 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3361-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2017:0407-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-5546 · Vendor Advisory
• http://openwall.com/lists/oss-security/2017/01/21/3 · Patch
• https://ubuntu.com/security/notices/USN-3234-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-2584 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3359-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-9755 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-2596 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3234-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-9150 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2017-0063.html · Security Note