CVE-2023-6779: Gnu Glibc buffer overflow (CVSS 8.2)

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityNone

IntegrityLow

AvailabilityHigh

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

Affected products

Gnu Glibc≥ 2.37 < 2.39

Fedoraproject Fedora38 · 39

Remediation

Fixed in

Gnu Glibc≥ 2.39

References

http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.htmlExploitThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2023-6779Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254395Issue Tracking
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
http://seclists.org/fulldisclosure/2024/Feb/3ExploitMailing ListThird 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
https://security.netapp.com/advisory/ntap-20240223-0006/Third Party Advisory
https://www.openwall.com/lists/oss-security/2024/01/30/6ExploitMailing List

and 1 more references

Related CVEs

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Frequently asked

Is CVE-2023-6779 being actively exploited?

CVE-2023-6779 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 3.15%.

How severe is CVE-2023-6779?

CVE-2023-6779 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 3.15% probability of exploitation.

Which products are affected by CVE-2023-6779?

Affected products include Gnu Glibc, Fedoraproject Fedora.

How do I fix CVE-2023-6779?

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-2023-6779 against the real software inventory on every managed device, every day. 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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