远程主机受到 GLSA-201810-05 中所述漏洞的影响（xkbcommon：多个漏洞）在 libxkbcommon 中发现多个漏洞。请检查下面引用的 CVE 标识符以了解详细信息。影响：本地攻击者可提供特别构建的 keymap 文件，从而可能导致拒绝服务情况。解决方法：目前无任何已知的解决方法。

USN-3786-1 修复了 libxkbcommon 中的多个漏洞。此更新提供针对 Ubuntu 18.04 LTS 的相应更新。

原始公告详细信息：

发现 libxkbcommon 未能正确处理某些文件。
攻击者可能利用此问题造成拒绝服务。(CVE-2018-15853、CVE-2018-15854、CVE-2018-15855、CVE-2018- 15856、CVE-2018-15857、CVE-2018-15858、CVE-2018-15859、CVE-2018-15861、CVE-2018-15862、CVE-2018-15863、CVE-2018-15864)

请注意，Tenable Network Security 已直接从 Ubuntu 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下，尽可能进行自动清理和排版。

安全修复：- libX11：ListExt.c 的 XListExtensions 中发生无效回复，进而导致崩溃 (CVE-2018-14598) - libX11：ListExt.c 的 XListExtensions 中发生差一错误 (CVE-2018-14599) - libX11：ListExt.c 的 XListExtensions 中发生越界写入 (CVE-2018-14600) - libxkbcommon：ExprAppendMultiKeysymList 中发生无效释放，进而导致崩溃 (CVE-2018-15857) - libxkbcommon：xkbcomp/expr.c 中发生无限递回，进而导致崩溃 (CVE-2018-15853) - libxkbcommon：空指针取消引用导致崩溃 (CVE-2018-15854) - libxkbcommon：处理　xkb_geometry　时发生空指针取消引用 (CVE-2018-15855) - libxkbcommon：意外连线 EOL 时发生无限循环，进而导致崩溃 (CVE-2018-15856) - libxkbcommon：在 ExprResolveLhs 中解析无效的原子时发生空指针取消引用，进而导致崩溃 (CVE-2018-15859) - libxkbcommon：ExprResolveLhs 中的空指针取消引用导致崩溃 (CVE-2018-15861) - libxkbcommon：LookupModMask 中的空指针取消引用导致崩溃 (CVE-2018-15862) - libxkbcommon：ResolveStateAndPredicate 中的空指针取消引用导致崩溃 (CVE-2018-15863) - libxkbcommon：resolve_keysym 中的空指针取消引用导致崩溃 (CVE-2018-15864)

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has xorg-x11-drv-ati packages installed that are affected by multiple vulnerabilities:

  - An issue was discovered in XListExtensions in ListExt.c in libX11 through 1.6.5. A malicious server can     send a reply in which the first string overflows, causing a variable to be set to NULL that will be freed     later on, leading to DoS (segmentation fault). (CVE-2018-14598)

  - An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable     to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other     impact. (CVE-2018-14599)

  - An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a     variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading     to DoS or remote code execution. (CVE-2018-14600)

  - Endless recursion exists in xkbcomp/expr.c in xkbcommon and libxkbcommon before 0.8.1, which could be used     by local attackers to crash xkbcommon users by supplying a crafted keymap file that triggers boolean     negation. (CVE-2018-15853)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL     pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because geometry tokens were     desupported incorrectly. (CVE-2018-15854)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL     pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because the XkbFile for an     xkb_geometry section was mishandled. (CVE-2018-15855)

  - An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon     before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted     keymap files. (CVE-2018-15856)

  - An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be     used by local attackers to crash xkbcommon keymap parsers or possibly have unspecified other impact by     supplying a crafted keymap file. (CVE-2018-15857)

  - Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon     before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by     supplying a crafted keymap file, because lookup failures are mishandled. (CVE-2018-15859)

  - Unchecked NULL pointer usage in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file that triggers an xkb_intern_atom failure. (CVE-2018-15861)

  - Unchecked NULL pointer usage in LookupModMask in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by     local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file with invalid virtual modifiers. (CVE-2018-15862)

  - Unchecked NULL pointer usage in ResolveStateAndPredicate in xkbcomp/compat.c in xkbcommon before 0.8.2     could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a     crafted keymap file with a no-op modmask expression. (CVE-2018-15863)

  - Unchecked NULL pointer usage in resolve_keysym in xkbcomp/parser.y in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file, because a map access attempt can occur for a map that was never created. (CVE-2018-15864)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has mesa-libGLw packages installed that are affected by multiple vulnerabilities:

  - An issue was discovered in XListExtensions in ListExt.c in libX11 through 1.6.5. A malicious server can     send a reply in which the first string overflows, causing a variable to be set to NULL that will be freed     later on, leading to DoS (segmentation fault). (CVE-2018-14598)

  - An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable     to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other     impact. (CVE-2018-14599)

  - An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a     variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading     to DoS or remote code execution. (CVE-2018-14600)

  - Endless recursion exists in xkbcomp/expr.c in xkbcommon and libxkbcommon before 0.8.1, which could be used     by local attackers to crash xkbcommon users by supplying a crafted keymap file that triggers boolean     negation. (CVE-2018-15853)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL     pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because geometry tokens were     desupported incorrectly. (CVE-2018-15854)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL     pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because the XkbFile for an     xkb_geometry section was mishandled. (CVE-2018-15855)

  - An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon     before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted     keymap files. (CVE-2018-15856)

  - An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be     used by local attackers to crash xkbcommon keymap parsers or possibly have unspecified other impact by     supplying a crafted keymap file. (CVE-2018-15857)

  - Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon     before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by     supplying a crafted keymap file, because lookup failures are mishandled. (CVE-2018-15859)

  - Unchecked NULL pointer usage in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file that triggers an xkb_intern_atom failure. (CVE-2018-15861)

  - Unchecked NULL pointer usage in LookupModMask in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by     local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file with invalid virtual modifiers. (CVE-2018-15862)

  - Unchecked NULL pointer usage in ResolveStateAndPredicate in xkbcomp/compat.c in xkbcommon before 0.8.2     could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a     crafted keymap file with a no-op modmask expression. (CVE-2018-15863)

  - Unchecked NULL pointer usage in resolve_keysym in xkbcomp/parser.y in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file, because a map access attempt can occur for a map that was never created. (CVE-2018-15864)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libxkbcommon packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1     could be used by local attackers to crash (NULL pointer     dereference) the xkbcommon parser by supplying a     crafted keymap file, because geometry tokens were     desupported incorrectly.(CVE-2018-15854)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1     could be used by local attackers to crash (NULL pointer     dereference) the xkbcommon parser by supplying a     crafted keymap file, because the XkbFile for an     xkb_geometry section was mishandled.(CVE-2018-15855)

  - An infinite loop when reaching EOL unexpectedly in     compose/parser.c (aka the keymap parser) in xkbcommon     before 0.8.1 could be used by local attackers to cause     a denial of service during parsing of crafted keymap     files.(CVE-2018-15856)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has libxkbcommon packages installed that are affected by multiple vulnerabilities:

  - Unchecked NULL pointer usage in LookupModMask in     xkbcomp/expr.c in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference)     the xkbcommon parser by supplying a crafted keymap file     with invalid virtual modifiers. (CVE-2018-15862)

  - Unchecked NULL pointer usage in ResolveStateAndPredicate     in xkbcomp/compat.c in xkbcommon before 0.8.2 could be     used by local attackers to crash (NULL pointer     dereference) the xkbcommon parser by supplying a crafted     keymap file with a no-op modmask expression.
    (CVE-2018-15863)

  - Unchecked NULL pointer usage in resolve_keysym in     xkbcomp/parser.y in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference)     the xkbcommon parser by supplying a crafted keymap file,     because a map access attempt can occur for a map that     was never created. (CVE-2018-15864)

  - Endless recursion exists in xkbcomp/expr.c in xkbcommon     and libxkbcommon before 0.8.1, which could be used by     local attackers to crash xkbcommon users by supplying a     crafted keymap file that triggers boolean negation.
    (CVE-2018-15853)

  - Unchecked NULL pointer usage when parsing invalid atoms     in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before     0.8.2 could be used by local attackers to crash (NULL     pointer dereference) the xkbcommon parser by supplying a     crafted keymap file, because lookup failures are     mishandled. (CVE-2018-15859)

  - Unchecked NULL pointer usage in ExprResolveLhs in     xkbcomp/expr.c in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference)     the xkbcommon parser by supplying a crafted keymap file     that triggers an xkb_intern_atom failure.
    (CVE-2018-15861)

  - An invalid free in ExprAppendMultiKeysymList in     xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be     used by local attackers to crash xkbcommon keymap     parsers or possibly have unspecified other impact by     supplying a crafted keymap file. (CVE-2018-15857)

  - An infinite loop when reaching EOL unexpectedly in     compose/parser.c (aka the keymap parser) in xkbcommon     before 0.8.1 could be used by local attackers to cause a     denial of service during parsing of crafted keymap     files. (CVE-2018-15856)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1     could be used by local attackers to crash (NULL pointer     dereference) the xkbcommon parser by supplying a crafted     keymap file, because the XkbFile for an xkb_geometry     section was mishandled. (CVE-2018-15855)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1     could be used by local attackers to crash (NULL pointer     dereference) the xkbcommon parser by supplying a crafted     keymap file, because geometry tokens were desupported     incorrectly. (CVE-2018-15854)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-2079 advisory.

  - An issue was discovered in XListExtensions in ListExt.c in libX11 through 1.6.5. A malicious server can     send a reply in which the first string overflows, causing a variable to be set to NULL that will be freed     later on, leading to DoS (segmentation fault). (CVE-2018-14598)

  - An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable     to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other     impact. (CVE-2018-14599)

  - Endless recursion exists in xkbcomp/expr.c in xkbcommon and libxkbcommon before 0.8.1, which could be used     by local attackers to crash xkbcommon users by supplying a crafted keymap file that triggers boolean     negation. (CVE-2018-15853)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL     pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because the XkbFile for an     xkb_geometry section was mishandled. (CVE-2018-15855)

  - An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a     variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading     to DoS or remote code execution. (CVE-2018-14600)

  - Unchecked NULL pointer usage in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL     pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because geometry tokens were     desupported incorrectly. (CVE-2018-15854)

  - An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon     before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted     keymap files. (CVE-2018-15856)

  - Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon     before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by     supplying a crafted keymap file, because lookup failures are mishandled. (CVE-2018-15859)

  - Unchecked NULL pointer usage in ResolveStateAndPredicate in xkbcomp/compat.c in xkbcommon before 0.8.2     could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a     crafted keymap file with a no-op modmask expression. (CVE-2018-15863)

  - An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be     used by local attackers to crash xkbcommon keymap parsers or possibly have unspecified other impact by     supplying a crafted keymap file. (CVE-2018-15857)

  - Unchecked NULL pointer usage in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file that triggers an xkb_intern_atom failure. (CVE-2018-15861)

  - Unchecked NULL pointer usage in LookupModMask in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by     local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file with invalid virtual modifiers. (CVE-2018-15862)

  - Unchecked NULL pointer usage in resolve_keysym in xkbcomp/parser.y in xkbcommon before 0.8.2 could be used     by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap     file, because a map access attempt can occur for a map that was never created. (CVE-2018-15864)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
118505	GLSA-201810-05：xkbcommon：多个漏洞	Nessus	Gentoo Local Security Checks	10/31/2018	1/31/2022	high
118794	Ubuntu 18.04 LTS：libxkbcommon 漏洞 (USN-3786-2)	Nessus	Ubuntu Local Security Checks	11/7/2018	10/21/2023	high
164608	Nutanix AOS：多个漏洞 (NXSA-AOS-5.11.2)	Nessus	Misc.	9/1/2022	5/14/2024	critical
128206	Scientific Linux 安全更新：SL7.x x86_64 上的 X.org	Nessus	Scientific Linux Local Security Checks	8/27/2019	5/1/2024	critical
174058	NewStart CGSL CORE 5.05 / MAIN 5.05 : xorg-x11-drv-ati Multiple Vulnerabilities (NS-SA-2023-0026)	Nessus	NewStart CGSL Local Security Checks	4/11/2023	4/11/2023	critical
174065	NewStart CGSL CORE 5.05 / MAIN 5.05 : mesa-libGLw Multiple Vulnerabilities (NS-SA-2023-0024)	Nessus	NewStart CGSL Local Security Checks	4/11/2023	4/11/2023	critical
144269	EulerOS 2.0 SP5 : libxkbcommon (EulerOS-SA-2020-2554)	Nessus	Huawei Local Security Checks	12/15/2020	2/1/2024	medium
164573	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.16)	Nessus	Misc.	9/1/2022	4/10/2024	critical
132511	NewStart CGSL CORE 5.05 / MAIN 5.05 : libxkbcommon Multiple Vulnerabilities (NS-SA-2019-0246)	Nessus	NewStart CGSL Local Security Checks	12/31/2019	1/14/2021	high
180786	Oracle Linux 7 : Xorg (ELSA-2019-2079)	Nessus	Oracle Linux Local Security Checks	9/7/2023	9/7/2023	critical

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