Apple Safari HTTP/2 HEIST information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Apple Safari and classified as problematic. This impacts an unknown function of the component HTTP/2 Handler. Such manipulation leads to information disclosure (HEIST). This vulnerability is listed as CVE-2016-7153. There is no available exploit. This vulnerability has historical importance owing to its background and reception. It is advised to implement the suggested workaround.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Apple Safari (Web Browser) (the affected version is unknown). Affected by this issue is an unknown code of the component HTTP/2 Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (HEIST). Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

The HTTP/2 protocol does not consider the role of the TCP congestion window in providing information about content length, which makes it easier for remote attackers to obtain cleartext data by leveraging a web-browser configuration in which third-party cookies are sent, aka a "HEIST" attack.

The weakness was presented 08/03/2016 by Mathy Vanhoef and Tom Van Goethem with iMinds-DistriNet as HEIST: HTTP Encrypted Information can be Stolen through TCP-windows as confirmed paper (Blackhat). The advisory is available at blackhat.com. The vendor was not involved in the coordination of the public release. This vulnerability is handled as CVE-2016-7153 since 09/06/2016. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/08/2025). This vulnerability is assigned to T1592 by the MITRE ATT&CK project. This vulnerability has a historic impact due to its background and reception.

The vulnerability scanner Nessus provides a plugin with the ID 261316 (Linux Distros Unpatched Vulnerability : CVE-2016-7153), which helps to determine the existence of the flaw in a target environment.

The best possible mitigation is suggested to be Workaround.

The vulnerability is also documented in the databases at Tenable (261316) and SecurityFocus (BID 92773†). arstechnica.com is providing further details. See VDB-91292, VDB-91293, VDB-91294 and VDB-91295 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: HEIST
Class: Information disclosure / HEIST
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 261316
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2016-7153

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Workaround
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/03/2016 🔍
09/06/2016 +34 days 🔍
09/06/2016 +0 days 🔍
09/06/2016 +0 days 🔍
09/07/2016 +1 days 🔍
09/08/2025 +3288 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HEIST: HTTP Encrypted Information can be Stolen through TCP-windows
Researcher: Mathy Vanhoef, Tom Van Goethem
Organization: iMinds-DistriNet
Status: Confirmed

CVE: CVE-2016-7153 (🔍)
GCVE (CVE): GCVE-0-2016-7153
GCVE (VulDB): GCVE-100-91298
SecurityFocus: 92773 - HTTP/2 CVE-2016-7153 Information Disclosure Vulnerability
SecurityTracker: 1036741

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 09/07/2016 11:07
Updated: 09/08/2025 20:21
Changes: 09/07/2016 11:07 (50), 04/10/2019 22:18 (12), 09/15/2022 07:43 (3), 09/15/2022 07:48 (11), 09/08/2025 20:21 (16)
Complete: 🔍
Cache ID: 216::103

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