CVE-2023-6246: Gnu Glibc buffer overflow (CVSS 8.4)

Description

A 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 the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer.

CVSS 3.1 breakdown

Attack vectorLocal

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Gnu Glibc≥ 2.36 < 2.39

Fedoraproject Fedora38 · 39

Remediation

Fixed in

Gnu Glibc≥ 2.39

References

http://packetstormsecurity.com/files/176931/glibc-qsort-Out-Of-Bounds-Read-Write.htmlExploitThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.htmlExploitThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2023-6246Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2249053Issue TrackingThird Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
http://seclists.org/fulldisclosure/2024/Feb/3ExploitThird Party Advisory
http://seclists.org/fulldisclosure/2024/Feb/5ExploitThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/Mailing List
https://security.gentoo.org/glsa/202402-01Third Party Advisory

and 3 more references

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2023-6246 being actively exploited?

CVE-2023-6246 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 4.79%.

How severe is CVE-2023-6246?

CVE-2023-6246 has a CVSS 3.1 base score of 8.4, rated high. EPSS estimates a 4.79% probability of exploitation.

Which products are affected by CVE-2023-6246?

Affected products include Gnu Glibc, Fedoraproject Fedora.

How do I fix CVE-2023-6246?

Upgrade affected software to a fixed version, for example Gnu Glibc 2.39 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-6246 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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