PT-2022-1537 · Solarwinds · Serv-U

Published 2022-01-07 · Updated 2022-02-10 · CVE-2021-35247

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions SolarWinds Serv-U versions prior to 15.3

Description The issue is related to improper input validation in the Serv-U web login screen, specifically with LDAP authentication, allowing characters that were not sufficiently sanitized. This could potentially allow a remote attacker to elevate their privileges. Although the LDAP servers ignored improper characters, and no downstream effect has been detected, the vulnerability still poses a risk. It has been reported that hackers have exploited this vulnerability, but no specific details about the number of affected devices or real-world incidents are provided.

Recommendations For versions prior to 15.3, update to the latest version of Serv-U to ensure proper input validation is completed in all environments. As a temporary workaround, consider restricting access to the Serv-U web login screen to minimize the risk of exploitation.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2022-00742

CVE-2021-35247

Affected Products

Serv-U

References · 9

• https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_release_notes.htm · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-35247 · Vendor Advisory
• https://solarwinds.com/trust-center/security-advisories/cve-2021-35247 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-35247 · Security Note
• https://bdu.fstec.ru/vul/2022-00742 · Security Note
• https://t.me/thehackernews/1808 · Telegram Post
• https://cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35247 · Note
• https://t.me/true_secator/2540 · Telegram Post
• https://cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv · Note