CVE-2018-11236

stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution.

stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution.

• CVE-2018-11236: fix stack buffer overflow when realpath() input length is close to SSIZE_MAX.
• CVE-2024-2961: fix out-of-bound writes in ISO-2022-CN-EXT escape sequences

• CVE-2018-11236: fix stack buffer overflow when realpath() input length is close to SSIZE_MAX.
• CVE-2024-2961: fix out-of-bound writes in ISO-2022-CN-EXT escape sequences

Updated glibc packages fix security vulnerabilities:

An SSE2-optimized memmove implementation for i386 in sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S in the GNU C Library (aka glibc or libc6) 2.21 through 2.27 does not correctly perform the overlapping memory check if the source memory range spans the middle of the address space, resulting in corrupt data being produced by the copy operation. This may disclose information to context-dependent attackers, or result in a denial of service, or, possibly, code execution (CVE-2017-18269).

stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution (CVE-2018-11236).

These are all security issues fixed in the glibc-2.34-1.2 package on the GA media of openSUSE Tumbleweed.

This update for glibc fixes the following issues:

• CVE-2017-18269: Fix SSE2 memmove issue when crossing 2GB boundary (bsc#1094150)
• CVE-2018-11236: Fix overflow in path length computation (bsc#1094161)
• CVE-2018-11237: Don't write beyond buffer destination in __mempcpy_avx512_no_vzeroupper (bsc#1094154)

Non security bugs fixed:

• Fix crash in resolver on memory allocation failure (bsc#1086690)

This update for glibc fixes the following issues:

• CVE-2017-18269: Fix SSE2 memmove issue when crossing 2GB boundary (bsc#1094150)
• CVE-2018-11236: Fix overflow in path length computation (bsc#1094161)
• CVE-2018-11237: Don't write beyond buffer destination in __mempcpy_avx512_no_vzeroupper (bsc#1094154)

Non security bugs fixed:

• Fix crash in resolver on memory allocation failure (bsc#1086690)

This update for glibc fixes the following security issues:

• CVE-2017-18269: An SSE2-optimized memmove implementation for i386 did not correctly perform the overlapping memory check if the source memory range spaned the middle of the address space, resulting in corrupt data being produced by the copy operation. This may have disclosed information to context-dependent attackers, resulted in a denial of service or code execution (bsc#1094150).
• CVE-2018-11236: Prevent integer overflow on 32-bit architectures when processing very long pathname arguments to the realpath function, leading to a stack-based buffer overflow (bsc#1094161).
• CVE-2018-11237: An AVX-512-optimized implementation of the mempcpy function may have writen data beyond the target buffer, leading to a buffer overflow in __mempcpy_avx512_no_vzeroupper (bsc#1092877, bsc#1094154).

This update for glibc fixes the following issues:

Security issues fixed:

• CVE-2017-15804: Fix buffer overflow during unescaping of user names in the glob function in glob.c (bsc#1064580).
• CVE-2017-15670: Fix buffer overflow in glob with GLOB_TILDE (bsc#1064583).
• CVE-2017-15671: Fix memory leak in glob with GLOB_TILDE (bsc#1064569).
• CVE-2018-11236: Fix 32bit arch integer overflow in stdlib/canonicalize.c when processing very long pathname arguments (bsc#1094161).
• CVE-2017-12132: Reduce advertised EDNS0 buffer size to guard against fragmentation attacks (bsc#1051791).

This update for glibc fixes the following issues:

Security issues fixed:

• CVE-2017-15804: Fix buffer overflow during unescaping of user names in the glob function in glob.c (bsc#1064580).
• CVE-2017-15670: Fix buffer overflow in glob with GLOB_TILDE (bsc#1064583).
• CVE-2017-15671: Fix memory leak in glob with GLOB_TILDE (bsc#1064569).
• CVE-2018-11236: Fix 32bit arch integer overflow in stdlib/canonicalize.c when processing very long pathname arguments (bsc#1094161).
• CVE-2017-12132: Reduce advertised EDNS0 buffer size to guard against fragmentation attacks (bsc#1051791).
• CVE-2018-1000001: Avoid underflow of malloced area (bsc#1074293).

This update for glibc fixes the following issues:

Security issue fixed:

• CVE-2018-11236: Fix 32bit arch integer overflow in stdlib/canonicalize.c when processing very long pathname arguments (bsc#1094161).

Bug fixes:

• bsc#1086690: Fix crash in resolver on memory allocation failure.
• bsc#1077763: Fix allocation in in6ailist_add.
• bsc#1079625: Fix allocation in nss_compat for large number of memberships to a group.

Florian Weimer discovered that the GNU C Library incorrectly handled certain memory operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-12133)

It was discovered that the GNU C Library incorrectly handled certain SSE2-optimized memmove operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-18269)

It was discovered that the GNU C Library incorrectly handled certain pathname operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-11236)

It was discovered that the GNU C Library incorrectly handled certain AVX-512-optimized mempcpy operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-11237)

It was discovered that the GNU C Library incorrectly handled certain hostname loookups. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-19591)

Jakub Wilk discovered that the GNU C Library incorrectly handled certain memalign functions. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2018-6485)

It was discovered that the GNU C Library incorrectly ignored the LD_PREFER_MAP_32BIT_EXEC environment variable after security transitions. A local attacker could use this issue to bypass ASLR restrictions. (CVE-2019-19126)

It was discovered that the GNU C Library incorrectly handled certain regular expressions. A remote attacker could possibly use this issue to cause the GNU C Library to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-9169)

It was discovered that the GNU C Library incorrectly handled certain bit patterns. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2020-10029)

It was discovered that the GNU C Library incorrectly handled certain signal trampolines on PowerPC. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-1751)

It was discovered that the GNU C Library incorrectly handled tilde expansion. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-1752)

It was discovered that GNU C Library incorrectly handled netgroup requests. An attacker could possibly use this issue to cause a crash or execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2014-9984)

It was discovered that GNU C Library might allow context-dependent attackers to cause a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2015-20109)

It was discovered that GNU C Library when processing very long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution. This issue only affected Ubuntu 14.04 LTS. (CVE-2018-11236)

It was discovered that the GNU C library getcwd function incorrectly handled buffers. An attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2021-3999)

Charles Fol discovered that the GNU C Library iconv feature incorrectly handled certain input sequences. An attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2024-2961)