CVE-2016-7982

published 2017-01-18

CVE-2016-7982: Directory traversal vulnerability in ecrire/exec/valider_xml.php in SPIP 3.1.2 and earlier allows remote attackers to enumerate the files on the system via the…

Priority P2 67 high 7.5 CVSS 3.0

AV N AC L PR N UI N S U C H I N A N

EXPLOIT

Directory traversal vulnerability in ecrire/exec/valider_xml.php in SPIP 3.1.2 and earlier allows remote attackers to enumerate the files on the system via the var_url parameter in a valider_xml action.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
debian	spip	< spip 3.1.3-1 (bullseye)	spip 3.1.3-1 (bullseye)
spip	spip	<= 3.1.2	—
spip	spip	>= 0 < 3.1.3-1	3.1.3-1
spip	spip	>= 0 < 3.1.3-1	3.1.3-1
spip	spip	>= 0 < 3.1.3-1	3.1.3-1

Detection & IOCs extracted from sources · hover to see the quote

url http://spip-dev.srv/ecrire/?exec=valider_xml&var_url=/etc&ext=ini&recur=2↗

url http://spip-dev.srv/ecrire/?exec=valider_xml&var_url=file:///etc&ext=ini&recur=2↗

path ecrire/exec/valider_xml.php↗

• → Monitor HTTP requests to the SPIP endpoint `ecrire/` with query parameters `exec=valider_xml` combined with a `var_url` parameter containing filesystem paths (e.g. `/etc`) or PHP stream wrappers (e.g. `file:///`) — this is the direct exploitation pattern for file enumeration. ↗
• → Detect bypass attempts using PHP Wrappers in the `var_url` parameter (e.g. `file:///`) to circumvent path traversal protections introduced in SPIP 3.1.2. ↗
• → Alert on HTTP responses from `ecrire/exec/valider_xml.php` that contain directory listings or file names, as the vulnerable code echoes enumerated file results directly to the response output. ↗

• · SPIP 3.1.2 introduced a partial path traversal fix that was bypassable via PHP stream wrappers (`file:///`); detection rules must account for both raw path and wrapper-prefixed `var_url` values to avoid blind spots. ↗
• · Additional bypass vectors exist for Windows systems; detection logic should not be limited to Unix-style paths. ↗

CVSS provenance

nvd v3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd v2.0 5.0 MEDIUM AV:N/AC:L/Au:N/C:P/I:N/A:N

osv 7.5 HIGH

vendor_debian 7.5 HIGH

CVEs like this are exactly what “Exploited This Week” covers.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-22