Input validation error in chrony - CVE-2012-4502
Published: November 5, 2013 / Updated: December 16, 2021
Vulnerability identifier: #VU42390
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2012-4502
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows remote attackers to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (crash) via a crafted (1) REQ_SUBNETS_ACCESSED or (2) REQ_CLIENT_ACCESSES command request to the PKL_CommandLength function or crafted (3) RPY_SUBNETS_ACCESSED, (4) RPY_CLIENT_ACCESSES, (5) RPY_CLIENT_ACCESSES_BY_INDEX, or (6) RPY_MANUAL_LIST command reply to the PKL_ReplyLength function, which triggers an out-of-bounds read or buffer overflow.
Affected software
chrony
Gentoo Linux
Fedora
chrony
Gentoo Linux
Fedora
chrony
How to mitigate CVE-2012-4502
Install update from vendor's website.
chrony - addressed in versions 1.25-3.el5, 1.25-3.el6
External References
- http://git.tuxfamily.org/chrony/chrony.git/?p=chrony/chrony.git;a=commitdiff;h=7712455d9aa33d0db0945effaa07e900b85987b1
- http://permalink.gmane.org/gmane.comp.time.chrony.announce/15
- http://seclists.org/oss-sec/2013/q3/332
- http://www.debian.org/security/2013/dsa-2760
- https://bugzilla.redhat.com/show_bug.cgi?id=846392