CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
47.3%
Symfony/Serializer handles serializing and deserializing data structures
for Symfony, a PHP framework for web and console applications and a set of
reusable PHP components. Symfony versions 4.1.0 before 4.4.35 and versions
5.0.0 before 5.3.12 are vulnerable to CSV injection, also known as formula
injection. In Symfony 4.1, maintainers added the opt-in
csv_escape_formulas
option in the CsvEncoder
, to prefix all cells
starting with =
, +
, -
or @
with a tab \t
. Since then, OWASP added
2 chars in that list: Tab (0x09) and Carriage return (0x0D). This makes the
previous prefix char (Tab \t
) part of the vulnerable characters, and
OWASP suggests using the single quote '
for prefixing the value. Starting
with versions 4.4.34 and 5.3.12, Symfony now follows the OWASP
recommendations and uses the single quote '
to prefix formulas and add
the prefix to cells starting by \t
, \r
as well as =
, +
, -
and
@
.
github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8
github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8 (v4.4.35)
github.com/symfony/symfony/pull/44243
github.com/symfony/symfony/releases/tag/v5.3.12
github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x
launchpad.net/bugs/cve/CVE-2021-41270
nvd.nist.gov/vuln/detail/CVE-2021-41270
security-tracker.debian.org/tracker/CVE-2021-41270
ubuntu.com/security/notices/USN-5290-1
www.cve.org/CVERecord?id=CVE-2021-41270
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
47.3%