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 Subscribe |
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
CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-51437
CWE-ID:
CWE-203 - Observable discrepancy
Exploit availability: No
DescriptionThe 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.
Install updates from vendor's website.
Vulnerable software versionsApache Pulsar: 2.0.0 - 3.1.0
External linkshttp://lists.apache.org/thread/5kgmvvolf5tzp5rz9xjwfg2ncwvqqgl5
http://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.
