Regular Expression Denial of Service (ReDoS) in uap-core
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-5243 |
| CWE-ID | CWE-400 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
uap-core Web applications / Modules and components for CMS |
| Vendor | ua-parser |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Resource exhaustion
EUVDB-ID: #VU25628
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-5243
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a regular expression denial of service (REDoS).
The vulnerability exists due to overlapping capture groups when processing crafted User-Agent strings. A remote attacker can overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings, trigger resource exhaustion and perform a regular expression denial of service (REDoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsuap-core: 0.1.0 - 0.7.2
External linkshttp://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1
http://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9p
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.
