GNU C Library 2.25 Buffer Deserialization xdr_bytes/xdr_string UDP Packet deserialization

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in GNU C Library 2.25. Affected is the function xdr_bytes/xdr_string of the component Buffer Deserialization. Executing a manipulation as part of UDP Packet can lead to deserialization. The identification of this vulnerability is CVE-2017-8804. The attack may be launched remotely. There is no exploit available. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability was found in GNU C Library 2.25 (Software Library). It has been declared as problematic. This vulnerability affects the function xdr_bytes/xdr_string of the component Buffer Deserialization. The manipulation as part of a UDP Packet leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect availability. CVE summarizes:

The xdr_bytes and xdr_string functions in the GNU C Library (aka glibc or libc6) 2.25 mishandle failures of buffer deserialization, which allows remote attackers to cause a denial of service (virtual memory allocation, or memory consumption if an overcommit setting is not used) via a crafted UDP packet to port 111, a related issue to CVE-2017-8779.

The bug was discovered 05/04/2017. The weakness was shared 05/07/2017 by Marcus Meissner (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2017-8804 since 05/07/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 107086 (SUSE SLES11 Security Update : glibc (SUSE-SU-2018:0565-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170764 (SUSE Enterprise Linux Security Update for glibc (SUSE-SU-2018:0451-1)).

Proper firewalling of udp/111 (rpc) is able to address this issue. A possible mitigation has been published 11 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (107086) and SecurityFocus (BID 98339†). The entries VDB-112733 and VDB-112777 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Deserialization
CWE: CWE-502 / CWE-20
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: 107086
Nessus Name: SUSE SLES11 Security Update : glibc (SUSE-SU-2018:0565-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 63451
OpenVAS Name: SuSE Update for glibc openSUSE-SU-2018:0494-1 (glibc)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Firewalling: 🔍

Timelineinfo

05/04/2017 🔍
05/05/2017 +1 days 🔍
05/07/2017 +2 days 🔍
05/07/2017 +0 days 🔍
05/07/2017 +0 days 🔍
05/08/2017 +1 days 🔍
02/28/2018 +296 days 🔍
03/01/2018 +1 days 🔍
08/05/2024 +2349 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: openwall.com
Researcher: Marcus Meissner
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-8804 (🔍)
GCVE (CVE): GCVE-0-2017-8804
GCVE (VulDB): GCVE-100-100924
SecurityFocus: 98339 - GNU glibc CVE-2017-8804 Remote Denial of Service Vulnerability
OSVDB: - CVE-2017-8804 - glibc - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 05/08/2017 08:41
Updated: 08/05/2024 21:17
Changes: 05/08/2017 08:41 (79), 09/24/2020 13:02 (7), 08/05/2024 21:17 (28)
Complete: 🔍
Cache ID: 216::103

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