Information disclosure via CSS import filter bypass
Published Aug 5, 2024 · Updated Aug 12, 2024
Information disclosure in Roundcube Webmail 1.5.7 and earlier and 1.6.0 through 1.6.7 allows remote attackers to leak data via CSS. The mod_css_styles function checks a character-stripped copy for a flawed import pattern, then renders the original CSS, allowing a crafted @import rule to load attacker-controlled styles. An authenticated recipient must view the crafted email; imported CSS can select page attributes and send their values to an attacker-controlled server.
Summary
What happened
Information disclosure in Roundcube Webmail 1.5.7 and earlier and 1.6.0 through 1.6.7 allows remote attackers to leak data via CSS. The mod_css_styles function checks a character-stripped copy for a flawed import pattern, then renders the original CSS, allowing a crafted @import rule to load attacker-controlled styles. An authenticated recipient must view the crafted email; imported CSS can select page attributes and send their values to an attacker-controlled server.
The record
- CVE
- CVE-2024-42010
- Published
- Aug 5, 2024
- Updated
- Aug 12, 2024
- Vendor
- Roundcube
- Product
- Roundcube Webmail
- Classifications
- CWE-200, T1048
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 5, 2024CVE publishedPublication date reported by the CVE source.
- Aug 12, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=1.5.7
- Affected versionversion=1.6x <=1.6.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- SonarSource CSS import filter-bypass demonstrationproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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