SonicWall Email Security Unrestricted Upload of File Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2021-11-03
• Known to be used in ransomware campaigns
• EPSS: 17% chance of exploitation in the next 30 days (higher than 97% of CVEs)

[ Description ]Official description

SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.

CISA: SonicWall Email Security contains an unrestricted upload of file with dangerous type vulnerability that allows a post-authenticated attacker to upload a file to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 17 Nov 2021): 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

• psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008Vendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource