CVE-2023-6779

Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.

Se encontró un desbordamiento de búfer en la región Heap de la memoria de off-by-one en la función __vsyslog_internal de la librería glibc. Esta función es llamada por las funciones syslog y vsyslog. Este problema ocurre cuando estas funciones se llaman con un mensaje mayor que INT_MAX bytes, lo que genera un cálculo incorrecto del tamaño del búfer para almacenar el mensaje, lo que provoca un bloqueo de la aplicación. Este problema afecta a glibc 2.37 y posteriores.

*Credits: Red Hat would like to thank Qualys Threat Research Unit for reporting this issue.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-12-13 CVE Reserved
2024-01-31 CVE Published
2024-02-24 EPSS Updated
2024-08-02 CVE Updated
2024-08-02 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-122: Heap-based Buffer Overflow
CWE-787: Out-of-bounds Write

CAPEC

References (10)

URL	Tag	Source
https://access.redhat.com/security/cve/CVE-2023-6779	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254395	Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G	Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ	Mailing List
https://security.gentoo.org/glsa/202402-01	Third Party Advisory
https://security.netapp.com/advisory/ntap-20240223-0006	Third Party Advisory
https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt	Third Party Advisory

URL	Date	SRC
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html	2024-08-02
http://seclists.org/fulldisclosure/2024/Feb/3	2024-08-02
https://www.openwall.com/lists/oss-security/2024/01/30/6	2024-08-02

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Gnu Search vendor "Gnu"		Glibc Search vendor "Gnu" for product "Glibc"				>= 2.37 < 2.39 Search vendor "Gnu" for product "Glibc" and version " >= 2.37 < 2.39"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				38 Search vendor "Fedoraproject" for product "Fedora" and version "38"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				39 Search vendor "Fedoraproject" for product "Fedora" and version "39"		-		Affected