SB2025062109 - Multiple vulnerabilities in sslh

Description

This security bulletin contains information about 3 vulnerabilities.

1) Use of out-of-range pointer offset (CVE-ID: CVE-2025-46806)

CWE-ID: CWE-823 - Use of Out-of-range Pointer Offset

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory handling in is_openvpn_protocol() function in probe.c. A remote attacker can send specially crafted UDP packets to the affected server and perform a denial of service (DoS) attack.

2) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2025-46807)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a file descriptor exhaustion in sslh-select.c and sslh-ev.c. A remote attacker can send specially crafted UDP packets to the server and perform a denial of service (DoS) attack.

3) Input validation error (CVE-ID: N/A)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to insufficient validation of undefined syslog data. A local user with ability to generate syslog events can potentially crash the application. 

Remediation

Install update from vendor's website.

References

• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-46806
• https://github.com/yrutschle/sslh/releases/tag/v2.2.4
• https://github.com/yrutschle/sslh/commit/204305a88fb32cffaf1349253a2b052186ca8d39
• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-46807
• https://github.com/yrutschle/sslh/commit/ff8206f7c8a47f901b78a1b78db5a4c788f6aa6f