CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
6.7 | $0-$5k | 0.00 |
A vulnerability was found in XMLSoft libxml2 2.9.1 (Document Processing Software). It has been declared as critical. This vulnerability affects the function xmlXPathCompOpEval
of the file xpath.c. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability.
The weakness was published 12/18/2013 by Jan Pokorny with Red Hat as Handling of XPath function arguments in error case as confirmed git commit (GIT Repository). The advisory is available at git.gnome.org. The vendor was not involved in the coordination of the public release. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known.
It is declared as proof-of-concept.
Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.gnome.org. A possible mitigation has been published 2 days after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:
diff --git a/xpath.c b/xpath.c index 1f56b96..0ca8cfa 100644 --- a/xpath.c +++ b/xpath.c @@ -13524,10 +13524,15 @@ xmlXPathCompOpEval(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op) int frame; frame = xmlXPathSetFrame(ctxt); - if (op->ch1 != -1) + if (op->ch1 != -1) { total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]); - if (ctxt->valueNr < op->value) { + if (ctxt->error != XPATH_EXPRESSION_OK) { + xmlXPathPopFrame(ctxt, frame); + return (total); + } + } + if (ctxt->valueNr < ctxt->valueFrame + op->value) { xmlGenericError(xmlGenericErrorContext, "xmlXPathCompOpEval: parameter error\n"); ctxt->error = XPATH_INVALID_OPERAND;
Additional details are provided at mail.gnome.org.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 7.5VulDB Meta Temp Score: 6.7
VulDB Base Score: 7.5
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Exploiting
Class: Denial of serviceCWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Access: Public
Status: Proof-of-Concept
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Patch: git.gnome.org
Timeline
12/18/2013 🔍12/20/2013 🔍
12/24/2013 🔍
03/24/2019 🔍
Sources
Advisory: Handling of XPath function arguments in error caseResearcher: Jan Pokorny
Organization: Red Hat
Status: Confirmed
OSVDB: 101329
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
Entry
Created: 12/24/2013 23:28Updated: 03/24/2019 08:25
Changes: 12/24/2013 23:28 (52), 03/24/2019 08:25 (2)
Complete: 🔍
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