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CVE-2020-28493— Regular Expression Denial of Service (ReDoS)

Quick assessment

Affected
n/a jinja2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jinja2是一款基于Python的模板引擎。该产品具有完整的Unicode支持，并提供了可选的沙箱模板执行环境。 jinja2 from 0.0.0 and before 2.11.3 存在资源管理错误漏洞，该漏洞源于regex的ReDOS漏洞。

CVSS 5.3 · Medium EPSS 3.55% · P89

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-28493

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service (ReDoS)
Source: CVE Program / CVE List V5
Vulnerability Description
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDoS vulnerability is mainly due to the `_punctuation_re regex` operator and its use of multiple wildcards. The last wildcard is the most exploitable as it searches for trailing punctuation. This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Jinja2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jinja2是一款基于Python的模板引擎。该产品具有完整的Unicode支持，并提供了可选的沙箱模板执行环境。 jinja2 from 0.0.0 and before 2.11.3 存在资源管理错误漏洞，该漏洞源于regex的ReDOS漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- jinja2 0.0.0 ~ unspecified -

II. Public POCs for CVE-2020-28493

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III. Intelligence Information for CVE-2020-28493

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Patches & Fixes for CVE-2020-28493 (1)

Vendor Advisories for CVE-2020-28493 (2)

Mailing List Discussions for CVE-2020-28493 (1)

Other References for CVE-2020-28493 (1)

Same Patch Batch · n/a · 2021-02-01 · 42 CVEs total

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CVE-2020-24271 EasyCMS 跨站请求伪造漏洞
CVE-2020-36109 ASUS RT-AX86U 安全漏洞
CVE-2020-28194 Cccel-ppp 数字错误漏洞
CVE-2021-3350 MyBB 跨站脚本漏洞
CVE-2021-3349 GNOME Evolution 数据伪造问题漏洞
CVE-2021-3348 Linux kernel 资源管理错误漏洞
CVE-2020-13858 Mofi Network MOFI4500-4GXeLTE 信任管理问题漏洞
CVE-2020-13564 Sourceforge PhpGACL 跨站脚本漏洞
CVE-2020-15835 Mofi Network MOFI4500-4GXeLTE 授权问题漏洞
CVE-2020-15834 Mofi Network MOFI4500-4GXeLTE 信息泄露漏洞
CVE-2020-15833 Mofi Network MOFI4500-4GXeLTE 信任管理问题漏洞
CVE-2020-15832 Mofi Network MOFI4500-4GXeLTE 安全漏洞
CVE-2020-13860 Mofi Network MOFI4500-4GXeLTE 安全特征问题漏洞
CVE-2020-13859 Mofi Network MOFI-GXeLTE 安全漏洞
CVE-2020-13856 Mofi Network MOFI4500-4GXeLTE 安全漏洞
CVE-2020-13857 Mofi Network MOFI4500-4GXeLTE 安全漏洞

Showing top 20 of 42 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same vendor: n/a

V. Comments for CVE-2020-28493

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