Timing attack in SASL token signature verification in Apache Pulsar



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-51437
CWE-ID CWE-203
Exploitation vector Network
Public exploit N/A
Vulnerable software
Apache Pulsar
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor Apache Foundation

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Observable discrepancy

EUVDB-ID: #VU86330

Risk: High

CVSSv4.0: 8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-51437

CWE-ID: CWE-203 - Observable discrepancy

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication.

The vulnerability exists due to observable timing discrepancy in SASL authentication provider. A remote attacker can forge a SASL Role Token that will pass signature verification and bypass SASL authentication.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Apache Pulsar: 2.0.0 - 3.1.0

CPE2.3 External links

https://lists.apache.org/thread/5kgmvvolf5tzp5rz9xjwfg2ncwvqqgl5
https://www.openwall.com/lists/oss-security/2024/02/07/1


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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