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Samba Patches Vulnerability That Can Result in DoS, Distant Code Execution

By Ionut Arghire on November 18, 2022

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Samba this week launched patches for an integer overflow vulnerability that would doubtlessly result in arbitrary code execution.

An open supply Server Message Block (SMB) implementation for Linux and Unix techniques, Samba can be utilized as an Lively Listing Area Controller (AD DC).

Tracked as CVE-2022-42898 and impacting a number of Samba releases, the newly addressed safety defect exists within the Service for Consumer to Proxy (S4U2proxy) handler, which offers “a service that obtains a service ticket to a different service on behalf of a consumer.”

Additionally known as ‘constrained delegation’, the characteristic depends on request and response messages from the Kerberos ticket-granting service (TGS) change. Heimdal and MIT Kerberos libraries in Samba guarantee Kerberos assist and implement the Key Distribution Heart (KDC).

The affected libraries present an authentication mechanism via tickets that may comprise Privilege Attribute Certificates (PACs). The bug will be triggered by sending a specifically crafted request to the KDC server.

Due to this vulnerability, on 32-bit techniques, an authenticated attacker can overflow the buffer with 16-byte chunks of attacker-controlled knowledge. Profitable exploitation of this bug might result in a denial-of-service (DoS) situation or probably distant code execution (RCE). 64-bit techniques aren’t weak.

“Samba’s Kerberos libraries and AD DC failed to protect in opposition to integer overflows when parsing a PAC on a 32-bit system, which allowed an attacker with a cast PAC to deprave the heap,” Samba explains.

In accordance with the Samba group, KDC is essentially the most weak server, because it parses the attacker-controlled PAC within the S4U2Proxy handler.

“The secondary danger is to Kerberos-enabled file server installations in a non-AD realm. A non-AD Heimdal KDC controlling such a realm could go on an attacker-controlled PAC inside the service ticket,” the Samba group says.

Samba 4.15.12, 4.16.7, and 4.17.three have been launched with patches for this safety defect. Heimdal 7.7.1 additionally addresses this bug.

The US Cybersecurity and Infrastructure Safety Company (CISA) has inspired customers and directors to evaluate Samba’s advisory and take motion if mandatory. CISA and others warn that exploitation of the vulnerability could lead on to a whole system takeover.

Associated: Samba Patches Vital Flaws That Earned Researchers Large Rewards

Associated: Cisco Patches 33 Vulnerabilities in Enterprise Firewall Merchandise

Associated: SAP Patches Vital Vulnerabilities in BusinessObjects, SAPUI5

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