要点
- CVE-2021-21317 是影响 uap-core (uap-core project), uap-core 的中危 (CVSS 5.3)漏洞。
- 未来 30 天内被利用的概率（EPSS）：2.5%，高于 84.9% 的漏洞。
- 修复：升级到 0.11.0 或更高版本。
| Package | Affected versions | Patched versions |
|---|
| uap-core | < 0.11.0
| 0.11.0
|
| uap-core npm | < 0.11.0
| 0.11.0
|
Description
Impact
Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings.
Patches
Please update uap-core to >= v0.11.0
Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.
NVD description
uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This is fixed in version 0.11.0. Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.
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