CVE-2015-3042 : Détail

CVE-2015-3042

81.5%V3
Network
2015-04-14
20h00 +00:00
2017-09-16
07h57 +00:00
CVE.org
NVD
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Descriptions du CVE

Adobe Flash Player before 13.0.0.281 and 14.x through 17.x before 17.0.0.169 on Windows and OS X and before 11.2.202.457 on Linux allows attackers to execute arbitrary code or cause a denial of service (memory corruption) via unspecified vectors, a different vulnerability than CVE-2015-0347, CVE-2015-0350, CVE-2015-0352, CVE-2015-0353, CVE-2015-0354, CVE-2015-0355, CVE-2015-0360, CVE-2015-3038, CVE-2015-3041, and CVE-2015-3043.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE Other No informations.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 10 AV:N/AC:L/Au:N/C:C/I:C/A:C nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 37839

Date de publication : 2015-08-18 22h00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

Source: https://code.google.com/p/google-security-research/issues/detail?id=224&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id There’s an error in the PCRE engine version used in Flash that allows the execution of arbitrary PCRE bytecode, with potential for memory corruption and RCE. This issue is a duplicate of http://bugs.exim.org/show_bug.cgi?id=1546 originally reported to PCRE upstream by mikispag; I rediscovered the issue fuzzing Flash so have filed this bug report to track disclosure deadline for Adobe. The issue occurs in the handling of zero-length assertions; ie assertions where the object of the assertion is prepended with the OP_BRAZERO operator. Simplest testcase that will crash in an ASAN build is the following: (?(?<a>)?) This is pretty much a nonsense expression, and I'm not sure why it compiles successfully; but it corresponds to the statement that 'assert that named group 'a' optionally matches'; which is tautologically true regardless of 'a'. Regardless, we emit the following bytecode: 0000 5d0012 93 BRA [18] 0003 5f000c 95 COND [12] 0006 66 102 BRAZERO 0007 5e00050001 94 CBRA [5, 1] 000c 540005 84 KET [5] 000f 54000c 84 KET [12] 0012 540012 84 KET [18] 0015 00 0 END When this is executed, we reach the following code: /* The condition is an assertion. Call match() to evaluate it - setting the final argument match_condassert causes it to stop at the end of an assertion. */ else { RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, match_condassert, RM3); if (rrc == MATCH_MATCH) { condition = TRUE; ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2); while (*ecode == OP_ALT) ecode += GET(ecode, 1); <---- ecode is out of bounds at this point. If we look at the execution trace for this expression, we can see where this code goes wrong: exec 0x600e0000dfe4 93 [0x60040000dfd0 41] exec 0x600e0000dfe7 95 [0x60040000dfd0 41] exec 0x600e0000dfea 102 [0x60040000dfd0 41] <--- RMATCH recursive match exec 0x600e0000dfeb 94 [0x60040000dfd0 41] exec 0x600e0000dff0 84 [0x60040000dfd0 41] exec 0x600e0000dff3 84 [0x60040000dfd0 41] exec 0x600e0000dff6 84 [0x60040000dfd0 41] exec 0x600e0000dff9 0 [0x60040000dfd0 41] <--- recursive match returns before 0x600e0000dfe7 24067 <--- ecode == 0x...dfe7 after 0x600e00013dea If we look at the start base for our regex, it was based at dfe4; so dfe7 is the OP_COND, as expected. Looking at the next block of code, we're clearly expecting the assertion to be followed by a group; likely OP_CBRA or another opcode that has a 16-bit length field following the opcode byte. ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2); In this case, the insertion of the OP_BRAZERO has resulted in the expected OP_CBRA being shifted forward by a byte to 0x...dfeb; and this GET results in the value of 0x5e00 + 1 + LINK_SIZE being added to the ecode pointer, instead of the correct 0x0005 + 1 + LINK_SIZE, resulting in bytecode execution hopping outside of the allocated heap buffer. See attached for a crash PoC for the latest Chrome/Flash on x64 linux. https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37839.zip

Products Mentioned

Configuraton 0

Adobe>>Flash_player >> Version To (including) 11.2.202.451

Linux>>Linux_kernel >> Version -

Configuraton 0

Adobe>>Flash_player >> Version To (including) 13.0.0.264

Adobe>>Flash_player >> Version 14.0.0.125

Adobe>>Flash_player >> Version 14.0.0.145

Adobe>>Flash_player >> Version 14.0.0.176

Adobe>>Flash_player >> Version 14.0.0.179

Adobe>>Flash_player >> Version 15.0.0.152

Adobe>>Flash_player >> Version 15.0.0.167

Adobe>>Flash_player >> Version 15.0.0.189

Adobe>>Flash_player >> Version 15.0.0.223

Adobe>>Flash_player >> Version 15.0.0.239

Adobe>>Flash_player >> Version 15.0.0.246

Adobe>>Flash_player >> Version 16.0.0.235

Adobe>>Flash_player >> Version 16.0.0.257

Adobe>>Flash_player >> Version 16.0.0.287

Adobe>>Flash_player >> Version 16.0.0.296

Adobe>>Flash_player >> Version 17.0.0.134

Apple>>Mac_os_x >> Version -

Microsoft>>Windows >> Version -

Configuraton 0

Opensuse>>Opensuse >> Version 13.1

Opensuse>>Opensuse >> Version 13.2

Suse>>Suse_linux_enterprise_desktop >> Version 11.0

Suse>>Suse_linux_enterprise_desktop >> Version 12.0

    Suse>>Suse_linux_workstation_extension >> Version 12.0

      Configuraton 0

      Redhat>>Enterprise_linux_desktop_supplementary >> Version 5.0

      Redhat>>Enterprise_linux_desktop_supplementary >> Version 6.0

      Redhat>>Enterprise_linux_server_supplementary >> Version 5.0

      Redhat>>Enterprise_linux_server_supplementary >> Version 6.0

      Redhat>>Enterprise_linux_server_supplementary_eus >> Version 6.6.z

      Redhat>>Enterprise_linux_workstation_supplementary >> Version 6.0

      Références

      https://www.exploit-db.com/exploits/37839/
      Tags : exploit, x_refsource_EXPLOIT-DB
      http://www.securityfocus.com/bid/74062
      Tags : vdb-entry, x_refsource_BID
      https://security.gentoo.org/glsa/201504-07
      Tags : vendor-advisory, x_refsource_GENTOO
      http://www.securitytracker.com/id/1032105
      Tags : vdb-entry, x_refsource_SECTRACK
      http://rhn.redhat.com/errata/RHSA-2015-0813.html
      Tags : vendor-advisory, x_refsource_REDHAT