SolarWinds Serv-U Improper Input Validation Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-01-21

[ Description ]Official 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.

CISA: 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.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 4 Feb 2022): Apply updates per vendor instructions.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3_r…Release NotesVendor Advisory
• www.solarwinds.com/trust-center/security-advisories/cve-2021-35247Broken LinkVendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource