CVE-2019-19126
LowCVSS 3.3Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
On x86-64, GNU C Library (glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict mapping addresses for loaded libraries and bypass ASLR for setuid programs.
Risk Assessment
A local attacker can bypass ASLR in setuid programs, significantly easing exploitation of other vulnerabilities and privilege escalation.
Recommendation
Update glibc to version 2.31 or later, which properly ignores the LD_PREFER_MAP_32BIT_EXEC variable.
Other vulnerabilities in glibc
See all- CVE-2023-6779High
A heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This issue occurs when the syslog and vsyslog functions are called with a message larger than INT_MAX bytes, leading to an incorrect buffer size calculation and application crash.
- CVE-2015-5180High
The res_query function in libresolv in glibc before version 2.25 has a vulnerability that allows remote attackers to cause a denial of service through a NULL pointer dereference, leading to process crashes.
- CVE-2017-1000366High
glibc contains a vulnerability that allows specially crafted LD_LIBRARY_PATH values to manipulate the heap/stack, potentially resulting in arbitrary code execution. This affects glibc 2.25 and earlier.
- CVE-2015-5229High
The calloc function in the glibc package in Red Hat Enterprise Linux (RHEL) 6.7 and 7.2 does not properly initialize memory areas, which might allow context-dependent attackers to cause a denial of service (hang or crash) via unspecified vectors.
- CVE-2016-2856High
In glibc versions before 2.19-18+deb8u4 on Debian jessie and before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS, 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS, 2.21-0ubuntu4.2 on Ubuntu 15.10, and 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10, there is a lack of namespace check associated with file-descriptor passing. This allows local users to capture keystrokes and spoof data, potentially gaining privileges.
- CVE-2015-0235High
CVE-2015-0235 involves a heap-based buffer overflow in the __nss_hostname_digits_dots function in glibc in versions 2.2 and other 2.x versions before 2.18. This allows attackers to execute arbitrary code via the gethostbyname or gethostbyname2 functions.
- CVE-2014-4043High
The posix_spawn_file_actions_addopen function in glibc before 2.20 does not copy its path argument in accordance with the POSIX specification, allowing context-dependent attackers to trigger use-after-free vulnerabilities.
- CVE-2024-33600Medium
In glibc 2.15, a bug was introduced in the nscd daemon that causes a null pointer dereference when a not-found netgroup response is not added to the cache. This leads to a crash of nscd.
- CVE-2023-4813Medium
A flaw in glibc may cause the gaih_inet function to use freed memory in uncommon situations, leading to an application crash. This issue is only exploitable when getaddrinfo is called and the hosts database in /etc/nsswitch.conf is configured with SUCCESS=.
- CVE-2022-23219Critical
The deprecated compatibility function clnt_create in the sunrpc module of the GNU C Library (glibc) through 2.34 copies its hostname argument on the stack without validating its length. This may result in a buffer overflow, potentially leading to a denial of service or, if an application is not built with a stack protector enabled, arbitrary code execution.
Original NVD description (English source)
On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS