Vulnerability Name:

CVE-2021-26929 (CCN-196817)

Assigned:2021-02-13
Published:2021-02-13
Updated:2021-04-19
Summary:An XSS issue was discovered in Horde Groupware Webmail Edition through 5.2.22 (where the Horde_Text_Filter library before 2.3.7 is used). The attacker can send a plain text e-mail message, with JavaScript encoded as a link or email that is mishandled by preProcess in Text2html.php, because bespoke use of \x00\x00\x00 and \x01\x01\x01 interferes with XSS defenses.
CVSS v3 Severity:6.1 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
5.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
6.1 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
5.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
5.5 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-79
Vulnerability Consequences:Cross-Site Scripting
References:Source: MITRE
Type: CNA
CVE-2021-26929

Source: MISC
Type: Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/162187/Webmail-Edition-5.2.22-XSS-Remote-Code-Execution.html

Source: MISC
Type: Third Party Advisory
http://packetstormsecurity.com/files/162194/Horde-Groupware-Webmail-5.2.22-Cross-Site-Scripting.html

Source: XF
Type: UNKNOWN
hordewebmail-cve202126929-xss(196817)

Source: MISC
Type: Third Party Advisory
https://github.com/horde/webmail/releases

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20210219 [SECURITY] [DLA 2564-1] php-horde-text-filter security update

Source: CCN
Type: Horde Mailing List, Sat Feb 13 17:22:12 UTC 2021
[announce] [SECURITY] CVE 2021-26929: XSS vulnerability in Horde_Text_Filter

Source: CONFIRM
Type: Mailing List, Vendor Advisory
https://lists.horde.org/archives/announce/2021/001298.html

Source: CCN
Type: Packet Storm Security [04-14-2021]
Webmail Edition 5.2.22 XSS / Remote Code Execution

Source: CCN
Type: Packet Storm Security [04-15-2021]
Horde Groupware Webmail 5.2.22 Cross Site Scripting

Source: MISC
Type: Exploit, Third Party Advisory
https://www.alexbirnberg.com/horde-xss.html

Source: EXPLOIT-DB
Type: EXPLOIT
Offensive Security Exploit Database [04-15-2021]

Source: MISC
Type: Vendor Advisory
https://www.horde.org/apps/webmail

Vulnerable Configuration:Configuration 1:
  • cpe:/a:horde:groupware:*:*:*:*:webmail:*:*:* (Version <= 5.2.22)

    • Configuration 2:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    horde groupware *
    debian debian linux 9.0