CVE-2021-35247
SolarWinds Serv-U Improper Input Validation Vulner - [Actively Exploited]
Description
Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters. To insure proper input validation is completed in all environments. SolarWinds recommends scheduling an update to the latest version of Serv-U.
INFO
Published Date :
Jan. 10, 2022, 2:10 p.m.
Last Modified :
Nov. 21, 2024, 6:12 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
SolarWinds Serv-U versions 15.2.5 and earlier contain an improper input validation vulnerability that allows attackers to build and send queries without sanitization.
Apply updates per vendor instructions.
https://nvd.nist.gov/vuln/detail/CVE-2021-35247
Public PoC/Exploit Available at Github
CVE-2021-35247 has a 3 public PoC/Exploit
available at Github.
Go to the Public Exploits
tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-35247
.
URL | Resource |
---|---|
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm | Release Notes Vendor Advisory |
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 | Broken Link Vendor Advisory |
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm | Release Notes Vendor Advisory |
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 | Broken Link Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
Collection of resources for responding to the Log4j set of vulnerabilities.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-35247
vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-35247
vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm Added Reference https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Feb. 10, 2022
Action Type Old Value New Value Changed Reference Type https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm No Types Assigned https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm Release Notes, Vendor Advisory Changed CPE Configuration OR *cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:* versions up to (including) 15.2.5 OR *cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:* versions up to (excluding) 15.3 -
CVE Modified by [email protected]
Jan. 25, 2022
Action Type Old Value New Value Changed Description Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters. To insure proper input validation is completed in all environments. SolarWinds recommends scheduling an update to the latest version of Serv-U. Added Reference https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm [No Types Assigned] -
Modified Analysis by [email protected]
Jan. 19, 2022
Action Type Old Value New Value Removed CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) Removed CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Changed Reference Type https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 Broken Link https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 Broken Link, Vendor Advisory -
CVE Modified by [email protected]
Jan. 18, 2022
Action Type Old Value New Value Changed Description Serv-U web login screen was allowing characters that were not sanitized by the authentication mechanism. SolarWinds has updated the authentication mechanism to remedy this issue and prevent unauthorized parameters to be used in the Serv-U login screen With the Log4j issue in the wild, input fields across the internet have been tested for vulnerability. Although Serv-U was not affected by the log4j issue, It was discovered that better input validation could be implemented. Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized. SolarWinds has updated the input mechanism to perform additional validation and sanitization. Please Note: No downstream affect has been detected as the LDAP servers ignored improper characters -
Initial Analysis by [email protected]
Jan. 14, 2022
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 No Types Assigned https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247 Broken Link Added CWE NIST CWE-20 Added CPE Configuration OR *cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:* versions up to (including) 15.2.5
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-35247
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-35247
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.76 }} -0.05%
score
0.80926
percentile