CVE Vulnerabilities

CVE-2015-7849

Use After Free

Published: Aug 07, 2017 | Modified: Apr 20, 2025
CVSS 3.x
8.8
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
6.5 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:P
RedHat/V2
4.3 MODERATE
AV:N/AC:M/Au:N/C:N/I:N/A:P
RedHat/V3
Ubuntu
MEDIUM

Use-after-free vulnerability in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to possibly execute arbitrary code or cause a denial of service (crash) via crafted packets.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Name Vendor Start Version End Version
Ntp Ntp 4.2.0 (including) 4.2.8 (excluding)
Ntp Ntp 4.3.0 (including) 4.3.77 (excluding)
Ntp Ntp 4.2.8 (including) 4.2.8 (including)
Ntp Ntp 4.2.8-p1 (including) 4.2.8-p1 (including)
Ntp Ntp 4.2.8-p1-beta1 (including) 4.2.8-p1-beta1 (including)
Ntp Ntp 4.2.8-p1-beta2 (including) 4.2.8-p1-beta2 (including)
Ntp Ntp 4.2.8-p1-beta3 (including) 4.2.8-p1-beta3 (including)
Ntp Ntp 4.2.8-p1-beta4 (including) 4.2.8-p1-beta4 (including)
Ntp Ntp 4.2.8-p1-beta5 (including) 4.2.8-p1-beta5 (including)
Ntp Ntp 4.2.8-p1-rc1 (including) 4.2.8-p1-rc1 (including)
Ntp Ntp 4.2.8-p1-rc2 (including) 4.2.8-p1-rc2 (including)
Ntp Ntp 4.2.8-p2 (including) 4.2.8-p2 (including)
Ntp Ntp 4.2.8-p2-rc1 (including) 4.2.8-p2-rc1 (including)
Ntp Ntp 4.2.8-p2-rc2 (including) 4.2.8-p2-rc2 (including)
Ntp Ntp 4.2.8-p2-rc3 (including) 4.2.8-p2-rc3 (including)
Ntp Ntp 4.2.8-p3 (including) 4.2.8-p3 (including)
Ntp Ntp 4.2.8-p3-rc1 (including) 4.2.8-p3-rc1 (including)
Ntp Ntp 4.2.8-p3-rc2 (including) 4.2.8-p3-rc2 (including)
Ntp Ntp 4.2.8-p3-rc3 (including) 4.2.8-p3-rc3 (including)

Potential Mitigations

References