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CVE-2019-0053— Junos OS: Insufficient validation of environment variables in telnet client may lead to stack-based buffer overflow

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS中存在缓冲区错误漏洞，该漏洞源于程序没有充分验证环境变量。攻击者可利用该漏洞绕过veriexec限制。以下产品及版本受到影响：Juniper Networks Junos OS 12.3版本，12.3X48版本，14.1X53版本，15.1版本，15.1X49

AI Predicted 8.1 Difficulty: Moderate EPSS 0.59% · P45
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I. Basic Information for CVE-2019-0053

Vulnerability Information
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Vulnerability Title
Junos OS: Insufficient validation of environment variables in telnet client may lead to stack-based buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
Insufficient validation of environment variables in the telnet client supplied in Junos OS can lead to stack-based buffer overflows, which can be exploited to bypass veriexec restrictions on Junos OS. A stack-based overflow is present in the handling of environment variables when connecting via the telnet client to remote telnet servers. This issue only affects the telnet client — accessible from the CLI or shell — in Junos OS. Inbound telnet services are not affected by this issue. This issue affects: Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S13; 12.3X48 versions prior to 12.3X48-D80; 14.1X53 versions prior to 14.1X53-D130, 14.1X53-D49; 15.1 versions prior to 15.1F6-S12, 15.1R7-S4; 15.1X49 versions prior to 15.1X49-D170; 15.1X53 versions prior to 15.1X53-D237, 15.1X53-D496, 15.1X53-D591, 15.1X53-D69; 16.1 versions prior to 16.1R3-S11, 16.1R7-S4; 16.2 versions prior to 16.2R2-S9; 17.1 versions prior to 17.1R3; 17.2 versions prior to 17.2R1-S8, 17.2R2-S7, 17.2R3-S1; 17.3 versions prior to 17.3R3-S4; 17.4 versions prior to 17.4R1-S6, 17.4R2-S3, 17.4R3; 18.1 versions prior to 18.1R2-S4, 18.1R3-S3; 18.2 versions prior to 18.2R1-S5, 18.2R2-S2, 18.2R3; 18.2X75 versions prior to 18.2X75-D40; 18.3 versions prior to 18.3R1-S3, 18.3R2; 18.4 versions prior to 18.4R1-S2, 18.4R2.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS中存在缓冲区错误漏洞，该漏洞源于程序没有充分验证环境变量。攻击者可利用该漏洞绕过veriexec限制。以下产品及版本受到影响：Juniper Networks Junos OS 12.3版本，12.3X48版本，14.1X53版本，15.1版本，15.1X49
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S13 -

II. Public POCs for CVE-2019-0053

# POC Description Source Link Shenlong Link
1 A patched Arch Linux PKGBUILD to address CVE-2019-0053 (buffer overflow). Downloads and applies a (currently) unreleased patch from upstream. https://github.com/dreamsmasher/inetutils-CVE-2019-0053-Patched-PKGBUILD POC Details
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III. Intelligence Information for CVE-2019-0053

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Vendor Advisories for CVE-2019-0053 (1)

Exploits & Public PoCs for CVE-2019-0053 (2)

Mailing List Discussions for CVE-2019-0053 (3)

Other References for CVE-2019-0053 (1)

Same Patch Batch · Juniper Networks · 2019-07-11 · 5 CVEs total

CVE-2019-0046 Junos OS: EX4300 Series: Denial of Service upon receipt of large number of specific valid
CVE-2019-0048 EX4300 Series: When a firewall filter is applied to a loopback interface, other firewall f
CVE-2019-0049 Junos OS: RPD process crashes when BGP peer restarts
CVE-2019-0052 SRX Series: srxpfe process crash while JSF/UTM module parses specific HTTP packets

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-121

V. Comments for CVE-2019-0053

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