NULL pointer dereference in Fedora - CVE-2016-6866
Published: February 15, 2017 / Updated: August 4, 2020
Vulnerability identifier: #VU33599
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-6866
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. A remote attacker can trigger denial of service conditions via vectors involving an invalid password hash, which triggers a NULL pointer dereference and crash.
Affected software
Fedora
Arch Linux
slock (Alpine package)
slock
Arch Linux
slock (Alpine package)
slock
How to mitigate CVE-2016-6866
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
slock (Alpine package) - addressed in versions 1.3-r3, 1.4-r0
slock - addressed in versions 1.3-2.fc23, 1.3-2.fc24, 1.3-2.fc25
slock - addressed in versions 1.3-2.fc23, 1.3-2.fc24, 1.3-2.fc25
External References
- http://git.suckless.org/slock/commit/?id=d8bec0f6fdc8a246d78cb488a0068954b46fcb29
- http://s1m0n.dft-labs.eu/files/slock/slock.txt
- http://www.openwall.com/lists/oss-security/2016/08/18/22
- http://www.openwall.com/lists/oss-security/2016/08/18/24
- http://www.securityfocus.com/bid/92546
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2FYPV6QQPPYBL3Z2BYNYEJB67FSC55OR/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RZPEJQNVODYSI4WQXM5GQKXRO7TPK2VG/